Answer:
mol(SiO₂) mol(C) mol(SiC) mol(CO)
Row 1: 0.8 x 10 0.9 x 10 0.3 x 10 0.6 x 10
Row 2: 0.2 x 10 0.6 x 10 0.2 x 10 0.4 x 10
Row 3: 8.0 2.4 x 10 8.0 1.6 x 10
Row 4: 2.8 8.4 2.8 5.6
Row 5: 0.816 2.45 0.816 1.63
Explanation:
From the balanced equation:SiO₂(s) + 3C(s) → SiC(s) + 2CO(g),
It is clear that 1.0 mole of SiO₂ reacts with 3.0 moles of C to produce 1.0 mole of SiC and 2.0 moles of CO.
We can complete the table of no. of moles of each component:A. complete the first row. Express your answers using one significant figure separated by commas. Mol C, Mol SiC, Mol CO =
3.0 moles of SiO₂:
We use the triple amount of SiO₂, so we multiply the others by 3.0.
So, it will be 3.0 moles of SiO₂ with 9.0 moles of C that produce 3.0 moles of SiC and 6.0 moles of CO.
B. Complete the second row. Express your answers using one significant figure separated by commas. Mol SiO2, Mol SiC, Mol CO =
6.0 mole of C:
We use the double amount of C, so we multiply the others by 2.0.
So, it will be 2.0 moles of SiO₂ with 6.0 moles of C that produce 2.0 moles of SiC and 4.0 moles of CO.
C. Complete the third row. Express your answers using two significant figures separated by commas. Mol SiO2, Mol C, Mol SiC =
16.0 moles of CO:
We use the amount of CO higher by 8 times than that in the balanced equation, so we multiply the others by 8.0.
So, it will be 8.0 moles of SiO₂ with 24.0 moles of C that produce 8.0 moles of SiC and 16.0 moles of CO.
D. Complete the fourth row. Express your answers using two significant figures separated by commas. Mol SiO2, Mol C, Mol SiC =
2.8 moles of SiO₂:
We use the amount of SiO₂ higher by 2.8 times than that in the balanced equation, so we multiply the others by 2.8.
So, it will be 2.8 moles of SiO₂ with 8.4 moles of C that produce 2.8 moles of SiC and 5.6 moles of CO.
E. Complite the fifth row. Express your answers using three significant figures separated by commas. Mol SiO2, Mol SiC, Mol CO =
2.45 moles of C:
We use the amount of C lower by 0.8167 times than that in the balanced equation, so we multiply the others by 0.8167.
So, it will be 0.8167 moles of SiO₂ with 2.45 moles of C that produce 0.8167 moles of SiC and 1.633 moles of CO.
The answers are expressed in the required significant figures in the answer part (table above).
Answer:
A) [tex]3SiO_2(s)+9C(s)\rightarrow 3SiC(s)+6CO(g)[/tex]
B) [tex]2SiO_2(s)+6C(s)\rightarrow 2SiC(s)+4CO(g)[/tex]
C)[tex]8.0SiO_2(s)+24C(s)\rightarrow 8.0SiC(s)+16CO(g)[/tex]
D)[tex]2.8SiO_2(s)+8.4C(s)\rightarrow 2.8SiC(s)+5.6CO(g)[/tex]
E)[tex]0.816SiO_2(s)+2.45C(s)\rightarrow 0.816SiC(s)+1.63CO(g)[/tex]
Explanation:
[tex]SiO_2(s)+3C(s)\rightarrow SiC(s)+2CO(g)[/tex]
A) When 3 moles of silicon dioxide are present.
According to reaction 1 mole of silicon dioxide react with 3 moles of carbon to give 1 mole of silicon carbide and 2 moles of carbon monoxide.
Then 3 moles of silicon dioxide will react with :
[tex]\frac{3}{1}\times 3mol=9 mol[/tex] of carbon
Then 3 moles of silicon dioxide will give :
[tex]\frac{1}{1}\times 3 mol= 3 mol[/tex] of silicon carbide
Then 3 moles of silicon dioxide will give :
[tex]\frac{2}{1}\times 3 mol= 6 mol[/tex] of carbon monoxide
[tex]3SiO_2(s)+9C(s)\rightarrow 3SiC(s)+6CO(g)[/tex]
B) When 6 moles of carbon are present.
According to reaction 3 moles of carbon reacts with 1 mole of silicon dioxide react with to give 1 mole of silicon carbide and 2 moles of carbon monoxide.
Then 6 moles of carbon will react with :
[tex]\frac{1}{3}\times 6 mol=2 mol[/tex] of silicon dioxde
Then 3 moles of carbon will give :
[tex]\frac{1}{3}\times 6 mol= 2 mol[/tex] of silicon carbide
Then 6 moles of carbon will give :
[tex]\frac{2}{3}\times 6 mol= 4 mol[/tex] of carbon monoxide
[tex]2SiO_2(s)+6C(s)\rightarrow 2SiC(s)+4CO(g)[/tex]
C)When 6 moles of carbon are present.
According to reaction ,1 mole of silicon carbide and 2 moles of carbon monoxide is produced when, 3 moles of carbon reacts with 1 mole of silicon dioxide reacts.
Then 16 moles of carbon monoxide will be produced from :
[tex]\frac{1}{2}\times 16 mol=8 mol[/tex] of silicon dioxide
Then 16 moles of carbon monoxide will give :
[tex]\frac{3}{2}\times 16 mol= 24 mol[/tex] of carbon
Along with 16 moles of carbon monoxide will give :
[tex]\frac{1}{2}\times 16 mol= 8 mol[/tex] of silicon carbide
[tex]8SiO_2(s)+24C(s)\rightarrow 8SiC(s)+16CO(g)[/tex]
D) When 2.8 moles of silicon dioxide are present.
According to reaction 1 mole of silicon dioxide react with 3 moles of carbon to give 1 mole of silicon carbide and 2 moles of carbon monoxide.
Then 2.8 moles of silicon dioxide will react with :
[tex]\frac{3}{1}\times 2.8 mol=8.4 mol[/tex] of carbon
Then 2.8 moles of silicon dioxide will give :
[tex]\frac{1}{1}\times 2.8 mol= 2.8 mol[/tex] of silicon carbide
Then 2.8 moles of silicon dioxide will give :
[tex]\frac{2}{1}\times 2.8 mol= 5.6 mol[/tex] of carbon monoxide
[tex]2.8SiO_2(s)+8.4C(s)\rightarrow 2.8SiC(s)+5.6CO(g)[/tex]
E) When 2.45 moles of carbon are present.
According to reaction 3 moles of carbon reacts with 1 mole of silicon dioxide react with to give 1 mole of silicon carbide and 2 moles of carbon monoxide.
Then 2.45 moles of carbon will react with :
[tex]\frac{1}{3}\times 2.45 mol=0.8166 mol[/tex] of silicon dioxde
Then 3 moles of carbon will give :
[tex]\frac{1}{3}\times 2.45 mol= 0.8166 mol[/tex] of silicon carbide
Then 6 moles of carbon will give :
[tex]\frac{2}{3}\times 2.45 mol= 1.6333 mol[/tex] of carbon monoxide
[tex]0.816SiO_2(s)+2.45C(s)\rightarrow 0.816SiC(s)+1.63CO(g)[/tex]
Need asap! 25 pts! Magnetic iron oxide has 72.4% iron and 27.6% oxygen. What is the empirical formula?
Hi!
1. Assume that these percentages are the mass.
2. For each of Fe and O, divide the mass by the Ar (relative atomic mass).
Fe: 72.4/55.8 = 1.297 moles
O: 27.6/16 = 1.725 moles
3. Work out which mole value is smallest, then divide the bigger mole value by the smaller one.
1.297 is smaller than 1.725, so your empirical formula is 1.1297/1.1297 = 1 atom of iron, and 1.725/1.297 = 1.33 atoms of oxygen.
4. Ensure your atom values are whole numbers.
1.33 is not a whole number, so multiply both 1 and 1.33 by 3.
5. Write out your empirical formula.
Fe3O4
Hope that helps!
The empirical formula for magnetic iron oxide, given that it has 72.4% iron and 27.6% oxygen by mass, is Fe3O4.
Explanation:The problem asks us to find the empirical formula for magnetic iron oxide. Given the percentage composition of iron and oxygen in the compound, we can look at it as if we had 100g of the substance. This would give us 72.4g of iron (Fe) and 27.6g of oxygen (O).
First, we convert these amounts to moles. The atomic mass of iron is approximately 55.845 g/mol and for oxygen is approximately 16.00 g/mol. Therefore, we have 1.3 mol Fe and 1.72 mol O.
To find the empirical formula, we divide each of these by the smallest number of moles to get a ratio. So, we have Fe1O1.3. However, an empirical formula should consist of whole numbers. Therefore, if we multiply both by the same factor, in this case, a factor of 3 will give us whole numbers, we get Fe3O4. Therefore, the empirical formula for magnetic iron oxide is Fe3O4.
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What is the kinetic theory
The body of theory which explains the physical properties of matter in terms of motion so I think it’s A
The kinetic molecular theory is an atomic description of gaseous, liquid, and solid matter. It states that these molecules are in constant, random motion with kinetic energy dependent on temperature. This theory is fundamental in explaining properties of matter including the ideal gas law.
Explanation:The kinetic molecular theory is a scientific model that explains the behavior of gases. According to this theory, gases are comprised of a large number of tiny molecules, which are widely separated and in constant, random motion. These molecules engage in elastic collisions with each other and the walls of their container. The speed of these molecules, and consequently their kinetic energy, is determined by their absolute temperatures.
This theory is also extended to explain the properties of solids and liquids in terms of continuous random motion of atoms and molecules. In other words, the kinetic molecular theory is essentially an atomic description of matter, providing detailed explanations for various phenomena such as temperature, pressure, and heat transfer, among others.
Moreover, the ideal gas law ties in closely with the kinetic molecular theory. It can be expressed in terms of the mass of the gas's molecules and the average of the molecular speeds squared.
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Calculate the ph of a solution containing 0.75 m lactic acid and 0.25 m sodium lactate. recalculate after the addition of 0.05ml of hcl
pH= pKa+log[A-]/[HA]
pKa=-log(Ka)
-log(1.4/10^-4) (the Ka of lactic acid)
pKa=3.85
pH=3.85+log (0.25/.75)
pH=3.37
HCl is an acid, so the 0.05M HCl is added to the acid and subtracted from the base
pH= 3.85+ log(0.24/0.76)
pH=3.35 after addition of HCl
What does each variable stand for in PV=nRT?
Thank you.
Hello there!
Let's explain to you the different variables in the PV=nRT equation:
PV=nRT:
P = Pressure
V = Volume
n = Moles (number of moles)
R = Gas Constant (universal)
T = Temperature
This is the ideal use of the gas law.
When calculating these different variables, its units are:
P = ATM (atmospheres)
V = L (liters)
n = mol (Moles)
R = J (Joule)
T= K (Kelvin)
Answering questions by analyzing specific observations and using them to come to a more general understanding is known as __________
inductive reasoning
empiricism
skepticism
deductive reasoning
The correct answer would be inductive reasoning.
Primavera?
Answer: inductive reasoning
Explanation:
We know that inductive reasoning starts with a series of observation and use it to frame a theory or a particular conclusion by inspecting the related topics.
Therefore, Answering questions by analyzing specific observations and using them to come to a more general understanding is known as inductive reasoning.
which of the following would the kinetic theory address
The Kinetic Theory of gases states that the gases are made of small particles (atoms or molecules) which are in random motion.
Postulates of Kinetic Molecular Theory of gases:
1. All gases are made up of a large number of minute particles of molecules.
2. The molecules are separated from one another by large distances, called as intermolecular spaces.
3. The molecules are in the state of rapid motion in all directions. They collide with each other and the walls of the container, and thus change their directions.
4. There is no loss of energy when the molecules collide among themselves and the wall of the container.
5. The molecules are independent of each other as the molecules has no forces of interaction (repulsive or attractive) between molecules.
6. The pressure exerted by the gas is due to the collision of the molecules with the walls of the container per unit area.
7. The average Kinetic energy of the gas molecules is directly propotional to the absolute temperature.
Answer: vibrating molecules
Explanation:
a p e x
The nucleus of an atom holds 4 neutrons and 4 protons, how many electrons does it have
Atoms with an electric charge come charged by gaining or losing
Is the atoms of electric
Why will clay weather the fastest out of several types of soil?
certain types of rock, like granite, are very resistant to weathering. Igneous rocks tend to weather slowly because it is hard for water to penetrate them. Other types of rock, like limestone and marble are easily weathered because they dissolve easily in weak acids.
How are science and technology related? A. Science is a branch of technology. B. Science is the application of technological knowledge. C. Technology is the application of the knowledge gained by science.
The answer should be C. Technology is the application of the knowledge gained by science.
Answer:
C. Technology is the application of the knowledge gained by science.
Explanation:
Science is about the discovery of some novel compounds such as cancer curing drugs or understanding the kinetics of reaction mechanisms. Technology takes the discovery made by science and upscales the process and makes it more efficient. Technology involves stem cell engineering to create clones or making pesticide resistant plants.
All faculty members are happy to see students help each other. Dumbledore is particularly pleased with Hermione. Though, it should be mentioned that students should not simply copy off each other. You will not learn anything that way. Snape glares at Ron... Ron slouches in his chair. Snape thinks it’s time for a harder problem. How many milligrams of magnesium reacts with excess HCl to produce 31.2 mL of hydrogen gas at 754 Torr and 25.0◦C. The hydrogen is produced by the following reaction: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) Express your answer in milligrams
Answer:
[tex]m_{Mg}=30.8mgMg[/tex]
Explanation:
Hello,
Based on the given chemical reaction, as 31.2 mL of hydrogen are yielded, one computes its moles via the ideal gas equation under the stated conditions as shown below:
[tex]n_{H_2}=\frac{PV}{RT}=\frac{754torr*\frac{1atm}{760torr}*0.0312L}{0.082 \frac{atm*L}{mol*K}*298.15K}=1.27x10^{-3}molH_2[/tex]
Now, since the relationship between hydrogen and magnesium is 1 to 1, one computes its milligrams by following the shown below proportional factor development:
[tex]m_{Mg}=1.27x10^{-3}molH_2*\frac{1molMg}{1molH_2}*\frac{24.305gMg}{1molMg}*\frac{1000mgMg}{1gMg}\\m_{Mg}=30.8mgMg[/tex]
Best regards.
Based on the kinetic molecular theory, which of the following statements is correct about the particles in a sample of gas? They have negligible kinetic energy. There is negligible force of attraction between them. The space between them decreases with increase in temperature. Their average kinetic energy decreases with increase in temperature.
Answer:
There is negligible force of attraction between them.
Explanation:
According to kinetic molecular theory of gases:
a) They have high kinetic energy so the molecules show random motion.
b) The space between them increases with increase in temperature. With increase in temperature, the kinetic energy increases and the molecules move farther from each other, volume increases.
c) the average kinetic energy increases with increase in temperature
Thus only true statement is:
There is negligible force of attraction between them.
Based on the kinetic molecular theory, there is a negligible force of attraction between the particles in the sample of gas.
The correct statement is option B.
What kinetic molecular theory?Kinetic molecular theory state that the particles of gas are large spherical and are in constant motion and have a perfectly elastic collision.
This theory can explain both Boyle's law and Charles's law.
Thus, the correct option is B, There is a negligible force of attraction between them.
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to produce 4.00 L of a 250 mM solution of sodium hydroxide, how many grams of naOH must be dissolved?
Answer: [tex]1.56\times 10^{-3}g[/tex]
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
Molarity = 250mM = [tex]250\times 10^{-3}M[/tex]
n= moles of solute
[tex]V_s[/tex] = volume of solution in ml = 4L = 4000 ml
[tex]{\text {moles of solute}}=\frac{\text {given mass}}{\text {molar mass}}=\frac{xg}{40g/mol}=0.025x[/tex]
Now put all the given values in the formula of molarity, we get
[tex]250\times 10^{-3}=\frac{0.025\times x\times 1000}{4000ml}[/tex]
[tex]250\times 10^{-3}=\frac{0.025\times x\times 1000}{4000ml}[/tex]
[tex]x=1.56\times 10^{-3}g[/tex]
Therefore, the [tex]1.56\times 10^{-3}g[/tex] of NaOH must be dissolved.
At constant temperature and pressure, 2.05 g of oxygen gas O2 is added to a 1.0 L balloon containing 1.00 g of O2. What is the new volume of the balloon?
Answer:
1.50 L.
Explanation:
From the general gas law:PV = nRT,
Where, P is the pressure if the gas,
V is the volume if the gas container,
n is the no. of gas moles,
R is the general gas constant,
T is the temperature of the gas.
At constant P and T:n₁V₂ = n₂V₁.
V₁ = 1.0 L, V₂ = ??? L.
n₁ = mass/molar mass = (2.05 g)/(32.0 g/mol) = 0.064 mol.
n₂ is the no. of moles of the total gas (2.05 g + 1.0 g).n₂ = n₁ + (1.00 g)/(32.0 g/mol) = 0.0953 mol.
∴ V₂ = n₂V₁/n₁ = (0.0953 mol)(1.0 L)/(0.064 mol) = 1.489 L ≅ 1.50 L.
Rank the following elements by effective nuclear charge, Zeff, for a valence electron. F LI Be B N
F > N > B > Be > Li. This ranking is based on the decreasing effective nuclear charge (Zeff) experienced by a valence electron in the listed elements.
The element lithium (Li) has the lowest effective nuclear charge. One valence electron is 2s orbital. The nucleus has three protons (atomic number 3), however the inner electrons in the[tex]1s^2[/tex] orbital shield the valence electron, reducing its effective charge.
The Beryllium (Be) follows. The 2s orbital has two valence electrons. Despite having a higher atomic number (4) than lithium, the presence of two inner electrons in the [tex]1s^2[/tex] orbital provides more shielding and a somewhat higher effective nuclear charge.
Boron (B): Three valence electrons in the [tex]2s^2 2p^1[/tex]configuration. Boron's nucleus has more protons (atomic number 5), making it more positive. Compared to beryllium, the [tex]2p^1[/tex] electron provides less shielding for the valence electron, but the [tex]1s^2[/tex] electrons still protect the [tex]2s^2[/tex] electrons.
Nitrogen has a higher effective nuclear charge than boron. One additional proton (atomic number 7) in its nucleus boosts its positive charge. The presence of three [tex]2p^2[/tex] electrons reduces the shielding effect on the valence electron, enhancing its nucleus attraction.
Fluorine (F) has the highest effective nuclear charge. Nine protons make its nucleus extremely positively charged. Seven [tex]2p^5[/tex] electrons reduce shielding and attract the valence electron to the nucleus, resulting in the highest effective nuclear charge. Therefore, F > N > B > Be > Li is the decreasing order.
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The effective nuclear charge (Zeff) typically increases from left to right across a period in the periodic table. Therefore, for the elements F, Li, Be, B, and N, the rank order by Zeff, from lowest to highest, would be: Li < Be < B < N < F.
Explanation:The concept being asked here involves effective nuclear charge (Zeff), which highly depends on position in the periodic table. Generally, Zeff increases from left to right across a period. So, for a valence (outermost) electron in the elements you provided: F, Li, Be, B, and N, we would expect this trend to hold. The effective nuclear charge can be thought of as the net positive charge experienced by an electron in an atom. Inner electrons shield outer electrons from the full charge of the nucleus, leading to this effective reduction in charge.
Thus, using that knowledge, we can rank these elements as follows: Li < Be < B < N < F. This order means that Fluorine (F), being the furthest right on the periodic table, has the highest effective nuclear charge. The atomic nucleus of Fluorine exerts a stronger pull on its valence electron relative to the other elements that have been listed.
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Which central atom hybridization would you expect in the series bh−4, ch4, nh+4?
Expected:
sp³ in all three molecules.
ExplanationThe hybridization of the central atom is related to the number of electron domains around that atom.
[tex]\begin{array}{c|c|c}\textbf{Number of Electron Domains} & \textbf{Hybridization}&\textbf{Example}\\ 2 & \text{sp} & \text{C as in CO}_2\\ 3 & \text{sp}^{2} & \text{C in H}_2\text{C}=\text{CH}_2\\ 4 &\text{sp}^{3} & \text{C as in CH}_4\end{array}[/tex].
What is an electron domain?
An atom bonded to the central atom counts as one electron domain. That atom counts as one electron domain regardless of the bond order. One single bond counts as one electron domain. One double bond counts as one electron domain. One triple bond counts as one electron domain.A lone pair of electrons count as one electron domain.How many electron domains in BH₄⁻, CH₄, and NH₄⁺?
BH₄⁻: Four H atoms are bonded to the central B atom. That ensures an octet for the central B atom. No lone pairs are needed. Four electron domains from the four bonded atoms. sp³ hybridization.CH₄: Four electrons domains with four H atoms and no lone pair. sp³ hybridization.NH₄⁺: Four electrons with four H atoms and no lone pair. sp³ hybridization.Must show work for questions, if possible. (Please also explain, I don't understand)
1. A gas absorbs 0.0 J of heat and then performs 91.3 J of work. The change in internal energy of gas is
2. Two metals of equal mass with different heat capacities are subjected to the same amount of heat. Which undergoes the smallest change in temperature?
3. 30.0 mL of pure water at 280. K is mixed with 50.0 mL of pure water at 340 K. What is the final temperature?
Answers:
1. D) 91.3 J
2. A) The metal with the higher specific heat capacity
3. B) 318 K
Step-by-step explanation:
1. E, q, w
ΔE = q + w
By convention, anything leaving the system is negative and anything entering the system is positive.
q = 0.0 J
w = -91.3 J
E = 0.0 - 91.3 = -91.3 J
2. Specific heat capacity
q = mCΔT
C = q/(mΔT)
If q and m are the same for each metal, then
ΔT ∝ 1/C = k/C
As C increases, ΔT decreases.
Thus, the metal with the higher specific heat capacity will have the smaller temperature change.
3. Temperature on mixing
There are two heat flows in this problem.
Heat gained by cold water + heat lost by hot water = 0
q₁ + q₂ = 0
m₁CΔT₁ + m₂CΔT₂ = 0
m₁ΔT₁ x + m₂ΔT₂ = 0
Data:
m₁ = 30.0 g
T₁ = 280. K
m₂ = 50.0 g
T₂ = 340 K
Calculations:
ΔT₁ = T_f - Ti = T_f - T₁ = (T_f - 280.) K
ΔT₂ = T_f - Ti = T_f - T₂ = (T_f - 340) K
30.0(T_f - 280.) + 50.0(T_f - 340) = 0
30.0T_f - 8400 + 50.0T_f - 17 000 = 0
80.0T_f - 25 400 = 0
80.0T_f = 25 400
T_f =25 400/80.0
T_f = 318 K
The final temperature of the mixture is 318 K.
Write formation reactions for the following. [You must include the states of matter for each atom or compound.] a. Ca(NO3)2 (s), b. CH3OH (l), c. NaClO4 (s)
Answer:
a. Ca(s) + N₂(g) + 3O₂(g) → Ca(NO₃)₂(s).
b. C(s,graphite) + 2H₂(g) + 1/2O₂(g) → CH₃OH(l).
c. 3NaCl(s) + 4O₃(g) → 3NaClO₄(s).
Explanation:
a. The formation reaction of Ca(NO₃)₂(s) is:
Ca(s) + N₂(g) + 3O₂(g) → Ca(NO₃)₂(s).
1.0 mole of solid Ca reacts with 1.0 mole of N₂ gas and 3.0 moles of O₂ gas to produce 1.0 mole of solid Ca(NO₃)₂.b. The formation reaction of CH₃OH(l) is:
C(s,graphite) + 2H₂(g) + 1/2O₂(g) → CH₃OH(l).
1.0 mole of solid C (graphite) reacts with 2.0 mole of H₂ gas and 0.5 mole of O₂ gas to produce 1.0 mole of liquid CH₃OH.c. The formation reaction of NaClO₄(s) is:
3NaCl(s) + 4O₃(g) → 3NaClO₄(s).
3.0 moles of solid NaCl react with 4.0 moles of O₂ gas to produce 3.0 moles of solid NaClO₄.Formation reactions for Ca(NO3)2, CH3OH, and NaClO4 are demonstrated by combining the respective elements in their standard states to form the given compounds.
Explanation:To write the formation reactions for the given substances, we need to express how they are formed from their most stable forms of the elements in their standard states. Here are the formation reactions:
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What is the ph of pure water at 40.0°c if the kw at this temperature is 2.92 × 10-14?
Answer: pH = 6.77
Explanation:
1) Chemical equilibrium
2 H₂O (l) ⇄ H₃O⁺ (aq) + OH⁻ (aq)2) Equilibrium constant, Kw
Kw = [H₃O⁺] × [OH⁻]By stoichiometry [H₃O⁺] = [OH⁻]. Call it xKw = x²x² = 2.92 × 10⁻¹⁴ M²x = √ (2.92 × 10⁻¹⁴) = 1.709 × 10⁻⁷ M = [H₃O⁺]3) pH
pH = - log [H₃O⁺] = - log (1.709 × 10⁻⁷) = 6.77The pH of pure water at 40.0°C, given an autoionization constant (Kw) of 2.92 × 10-14, would be approximately 6.768. This value is derived from using the equations Kw=[H+][OH-] for the autoionization of water and pH = -log[H+] to calculate the pH.
Explanation:The question asks about the pH of pure water at 40.0°C if the autoionization constant (Kw) at this temperature is 2.92 × 10-14. Kw is the product of the molar concentrations of H+ ions and OH- ions in water. At any given temperature, Kw remains constant. In pure water (or any neutral solution), [H+] = [OH-] and therefore, pH = pOH.
As mentioned, Kw = [H+][OH-] , so in neutral water [H+] = [OH-] = sqrt(Kw). Given that Kw is 2.92 *10^-14, we can calculate [H+] = sqrt(2.92 *10^-14) = 1.708 *10^-7 M.
The formula to find the pH is pH = -log[H+]. Substituting in, pH = -log(1.708 *10^-7) = 6.768 which is slightly on the acidic side because the ideal neutral pH in standard conditions (25°C) is 7.
This demonstrates that the pH of pure water decreases (becomes more acidic) as the temperature increases.
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Which of the following units is used to express electrical charge? Question 2 options: Newton Coulomb Joule
The coulomb whose symbol is (C), is used to express charge. It is the SI unit of electric charge.
1 C is equivalent to charge carried by 6.24×10¹⁸ electrons. Although electrons are negatively charged, the Coulomb expresses both positive and negative charges.
Answer: Coulomb
Explanation:
[tex]Q=I\times t[/tex]
where Q= quantity of electricity
I = current in amperes
t= time in seconds
Thus charge is in coulomb. 1 coloumb of charge appears whe 1 ampere current is passed for 1 second.
Newton is the unit of force.
[tex]1kgms^{-2}=1Newton(N)[/tex]
Joule is the unit of energy.
[tex]1kgm^2s^{-2}=1 Joule[/tex]
[Standard Enthalpy Formation]
Remember to show work and explain.
1. Use the equation below to determine the amount of energy released when 78.0g Of H2S react with excess SO2.
2. How many grams of 2AgNO3 are needed to react to produce 567kJ of energy in the following reaction?
Answer:
1. 65.1 kJ; 2. 558 g
Step-by-step explanation:
1.
M_r: 34.08
2H₂S+ SO₂ ⟶ 3S + 2H₂O ; ΔH = -56.9 kJ
Treat the heat as if it were a product in the equation. Then use the molar ratio (56.9 kJ/2 mol H₂S) in the usual way.
Moles of H₂S = 78.0 g H₂S × (1 mol H₂S/34.08 g H₂S) = 2.289 mol H₂S
Amount of heat = 2.289 mol H₂S × (56.9 kJ/2 mol H₂S) = 65.1 kJ
The reaction releases 65.1 kJ of energy.
2.
M_r: 169.87
2AgNO₃ + BaCl₂ ⟶ 2AgCl + Ba(NO₃)₂; ΔH = -345 kJ
Moles of AgNO₃ = 567 kJ × (2 mol AgNO₃/345 kJ = 3.287 mol AgNO₃
Mass of AgNO₃ = 3.287 mol AgNO₃ × (169.87 g AgNO₃/1 mol AgNO₃)
= 558 g AgNO₃
You need 558 g of AgNO₃.
Pieces of one rock unit contained within another are called
The correct answer is - intrusive rocks.
The intrusion is a process in which the rising magma in the Earth's crust, manages to break through pre-existing layers of rock, and after that cool off, solidify, and create new intrusive igneous rocks. By doing so, the magma is breaking up the layers of rocks, thus the intrusive igneous rocks that are forming from it, come to be inside totally different rock units. The intrusions are always happening inside the crust, and the rocks formed from them are igneous rocks that have large crystals because of the slow cooling off of the magma.
____________ are compounds that contain a carbon-carbon triple bond.
Answer:
Alkynes are compounds that contain a carbon-carbon triple bond.Explanation:
The simplest organic compounds are formed excluseively by carbon and hydrogen. They are named hydrocarbons.There are 3 main types of hydrocarbons, namely alkanes, alkenes and alkynes.Alkanes posses only single bonds and have general formula Cₙ H₂ₙ ₊ ₂. E.g.: CH₃ - CH₃ (ethane).Alkenes have one or more double bonds between pairs of carbon atoms. E.g.: CH₃ - CH = CH₂ (propene).Alkynes contain one or more triple bonds between pairs of carbon atoms. E.g.: CH ≡ CH (ethyne or acethylene).Both alkenes and alkynes are named unsaturated hydrocarbons, because they have less hydrogen atoms than they could (if they only hade single bonds), while alkanes are saturated hydrocarbons.Calculate the enthalpy change for the reaction Mn3O4(s)+CO(g)⟶3MnO(s)+CO2(g) from the following:
Mn3O4(s)+4CO(g)⟶3Mn(s)+4CO2(g) ΔH=255.6kJ
MnO(s)+CO(g)⟶Mn(s)+CO2(g) ΔH=102.1kJ
Express your answer using one decimal place and include the appropriate units.
Answer:
- 50.7 kJ.
Explanation:
To get the enthalpy change for the reaction:Mn₃O₄(s) + CO(g) ⟶ 3MnO(s) + CO₂(g).
We must orient the given reactions in a way that its sum give the required reaction.The first reaction be as it is:
Mn₃O₄(s) + 4CO(g) ⟶ 3Mn(s) + 4CO₂(g), ΔH₁ = 255.6 kJ.
The second reaction should be reversed and multiplied by 3 and also the value of its ΔH must multiplied by (- 3):
3Mn(s) + 3CO₂(g) ⟶ 3MnO(s) + 3CO(g), ΔH₂ = (- 3)(102.1 kJ) = - 306.3 kJ.
By summing the two reactions after the modification, we get the required reaction:Mn₃O₄(s) + CO(g) ⟶ 3MnO(s) + CO₂(g).
∴ ΔH rxn = ΔH₁ + ΔH₂ = (255.6 kJ) + (- 306.3 kJ) = - 50.7 kJ.
Chemistry question! Please help!
When a solid (solute) comes in contact with the liquid (solvent), the solute goes about C) dissolution, in which the solid dissolves into the liquid.
~
As this is with regards to solute and solvent, the solid will eventually dissolve in the liquid. The answer is C. dissolution.
anyone know how to calculate moles? for chem.
If the atmospheric pressure in the laboratory is 1.2 atm, how many moles of gas were in each syringe?
^ this is my question
Trial 1:
volume for syringe: 4.2 ml
temperature: 0.9 - C
Trial 2:
volume for syringe: 4.1 ml
temperature: 0.9 - C
if you could also explain well I would appreciate it!
Answer:
Trial 1 : n = 0.0002241 moles
Trail 2 : n = 0.0002188 moles
Explanation:
Let's bring out the data in the question;
Pressure (P) = 1.2 atm
Number of moles (n) = ?
Both trials contain different values of Volume (V) and temperature (T)
The equation that relates all four parameters (V, T, P and n) is the ideal gas equation. It is given as;
PV = nRT where R = gas constant = 0.0821 L atm K−1 mol−1
Soving for n, we have;
n = PV / RT
Trial 1
Volume (V) = 4.2 ml = 0.0042 L (Converting to L by dividing by 1000)
Temperature (T) = 0.9 + 273 = 273.9K (Converting to Kelvin temperature)
n = (1.2 * 0.0042) / (0.0821 * 273.9)
n = 0.00504 / 22.48719
n = 0.0002241 moles
Trial 2
Volume (V) = 4.1 ml = 0.0041 L (Converting to L by dividing by 1000)
Temperature (T) = 0.9 + 273 = 273.9K (Converting to Kelvin temperature)
n = (1.2 * 0.0041) / (0.0821 * 273.9)
n = 0.00492 / 22.48719
n = 0.0002188 moles
Question 2(Multiple Choice Worth 3 points)
(07.05 MC)
The table shows the concentration of a reactant in the reaction mixture over a period of time.
Reactant Concentration
Time Concentration
0 s 1.8 M
210 s 1.2 M
450 s 0.8 M
580 s 0.6 M
720 s 0.4 M
What is the average rate of the reaction over the first 580 seconds?
1.6 × 10−3
1.9 × 10−3
2.0 × 10−3
2.2 × 10−3
Answer:
2.0 × 10−3
Explanation:
this is the correct answer, i don't know why people gave the other answer 3/5 stars because that answer and work was correct.
The average rate of reaction for the first 580 seconds is 2.0 × 10−3 M/s.
What is average rate of reaction?The average rate is defined as the ratio of the change in concentration to the time taken. We are required here to find the average rate of the reaction over the first 580 seconds.
Hence, we have;
average rate = 1.8 M - 0.6 M/580 s - 0 s = 1.2 M/580 s = 2.0 × 10−3 M/s
Hence, the average rate of reaction for the first 580 seconds is 2.0 × 10−3 M/s.
Learn more about average rate of reaction: https://brainly.com/question/11334504
Draw the structural formula for all the alkenes with the indicated molecular formula that, without undergoing a rearrangement, produce the compound shown as a major product g
ya got to go get sum to eat then get it
an unknown element is a solid at room temperature, is highly conductive, and is easily hammered into thin sheets. it is most likely a:
A. Metal
B. Non-metal
C. Metalloid
A. Metal
Metals are very conductive, malleable, and almost all of them are solid at room temperature.
Units used to measure the rate of electron flow