In determining the percent acetic acid in vinegar, the mass of each of vinegar sample is measured rather than the volume. explain.
Final answer:
When determining the percent acetic acid in vinegar, measuring the mass of vinegar is preferred over volume because mass is not affected by temperature and concentration changes. The mass can be used to calculate moles of acetic acid, which is then used to find molarity or mole fraction.
Explanation:
In the analysis of vinegar, it is often more accurate to measure the mass of the vinegar sample rather than the volume because mass is not affected by temperature or concentration variations as volume can be. When determining the percent acetic acid in vinegar, we can use the sample's mass to calculate the number of moles of acetic acid present. Let's say we have a sample where the concentration of acetic acid was previously found to be 0.839 Molarity (M). If we find that a certain volume of vinegar contains 75.6 g of acetic acid, we can use the molarity and the mass of acetic acid to determine the volume of the vinegar solution.
To calculate the mole fraction of acetic acid in the solution, the masses of both acetic acid and water in the sample are required. Using an example from LibreTexts, if 100.0 g of vinegar contains 3.78 g of acetic acid, then there are 96.2 g of water in the solution. From the masses, we determine the moles of acetic acid and water and then divide the number of moles of acetic acid by the total number of moles of substances in the sample to get the mole fraction.
The compound HA is an acid that is soluble in water which of the beakers in the picture shows HA behaving as a weak acid in water?
Final answer:
To identify the beaker showing HA behaving as a weak acid, we need to look for the beaker in which the concentration of H3O+ and A- is relatively low, indicating partial dissociation.
Explanation:
In the given question, we are asked to identify the beaker that shows the acid HA behaving as a weak acid in water.
A weak acid is one that only partially dissociates in water, creating a small amount of hydronium ions (H3O+) and the conjugate base (A-). Strong acids, on the other hand, completely dissociate into hydronium ions and the conjugate base.
To identify the beaker showing HA behaving as a weak acid, we need to look for the beaker in which the concentration of H3O+ and A- is relatively low, indicating partial dissociation.
The Kc for the following reaction at 225 ∘C is 1.7×102. 3H2(g)+N2(g)⇌2NH3(g)
If the equilibrium mixture contains 0.15 M H2 and 0.017 M N2, what is the molar concentration of NH3?
I have no idea what I am doing wrong here, help!
Answer:
Molar concentration of ammonia gas is 0.0987 M.
Explanation:
Concentration of hydrogen gas = [tex][H_2]=0.15 M[/tex]
Concentration of nitrogen gas = [tex][N_2]=0.017 M[/tex]
Concentration of ammonia gas = [tex][NH_3]=x[/tex]
Equilibrium constant of the reaction = [tex]K_c=1.7\times 10^2[/tex]
[tex]K_c=\frac{[NH_3]^2}{[H_2]^3\times [N_2]}[/tex]
[tex]1.7\times 10^2=\frac{x^2}{(0.15 M)^3\times (0.017 M)}[/tex]
[tex]9.5737\times 10^{-3} M^2=x^2[/tex]
x = 0.0987 M
Molar concentration of ammonia gas is 0.0987 M.
The molar concentration of NH₃ is approximately 0.0987 M.
To find the molar concentration of NH₃, we use the equilibrium constant expression.
Step-by-Step Solution:
Write the equilibrium constant expression:
Kc = [NH₃]₂ / ([H₂]₃ × [N₂])
Insert the known values into the expression:
1.7 × 10² = [NH₃]₂ / (0.15)³ × 0.017
Solve for [NH₃]:
First, compute the denominator:
(0.15)³ = 0.003375 and 0.003375 × 0.017 = 5.7375 × 10⁻⁵
Now solve for [NH₃]₂:
[NH₃]₂ = 1.7 × 10² × 5.7375 × 10⁻⁵
[NH₃]₂ = 0.00975475
Finally, take the square root of both sides to find [NH₃]:
[NH₃] = √0.00975475
[NH₃] ≈ 0.0987 M
Therefore, the molar concentration of NH₃ is approximately 0.0987 M.
An igneous rock contains a pb-206/u-238 mass ratio of 0.372. how old is the rock?
The age of the igneous rock with a Pb-206/U-238 mass ratio of 0.372 is approximately 1.7 billion years old, determined by the amount of U-238 that has decayed to Pb-206 and using the known half-life of U-238.
To determine the age of the igneous rock using its lead to uranium mass ratio, we apply the principles of radioactive decay, specifically the decay of Uranium-238 (U-238) into Lead-206 (Pb-206). Since each decay of U-238 produces one Pb-206, we can use this information to calculate the amount of U-238 that has decayed since the rock was formed. Knowing the half-life of U-238 is approximately 4.5 billion years, and the initial quantity of U-238 present would be equal to the sum of current U-238 and the Pb-206 produced from its decay.
The given Pb-206/U-238 mass ratio is 0.372. From this ratio, we can determine the fraction of U-238 that has decayed. Using the appropriate decay equation and the half-life, we can calculate the correct answer to be approximately 1.7 billion years, which is the approximate age of the rock.
The age of the rock is approximately 2.2 billion years.
To determine the age of the rock based on the Pb-206/U-238 mass ratio, we use the concept of radioactive decay and the uranium-lead (U-Pb) dating method.
Understanding Uranium-Lead Dating:
Uranium-238 (U-238) is a radioactive isotope that decays into lead-206 (Pb-206) through a series of radioactive decay steps.
The rate of decay of U-238 to Pb-206 is characterized by a half-life, which is the time it takes for half of the U-238 atoms to decay into Pb-206.
Using the Pb-206/U-238 Mass Ratio:
The Pb-206/U-238 mass ratio in the rock gives us information about the amount of lead-206 relative to uranium-238 at the time of rock formation.
The Pb-206/U-238 ratio changes over time due to the radioactive decay of uranium-238 into lead-206.
Calculating the Age:
The age of the rock can be calculated using the formula derived from radioactive decay principles.
We use the formula:
Age = log(Pb-206/U-238 ratio) / log(e^(λt) - 1)
Where:
λ is the decay constant of uranium-238.
t is the age of the rock in years.
Substituting Values:
Given that the Pb-206/U-238 mass ratio (R) = 0.372, we can rearrange the formula to solve for the age (t).
We use the decay constant (λ) of uranium-238.
Using Decay Constants:
The decay constant (λ) for uranium-238 is approximately 1.551 × 10⁻¹⁰ per year.
Calculating Age:
Substitute the values into the age formula to calculate the age of the rock:
Calculate log(0.372) ≈ -0.430.
Substitute the values into the age equation:
Age ≈ -0.430 / (1.551 × 10⁻¹⁰) ≈ 2.77 × 10⁹ years.
Final Answer:
The calculated age of the rock is approximately 2.77 × 10⁹ years, which is equivalent to about 2.2 billion years (since 1 billion years = 10⁹ years).
Therefore, based on the Pb-206/U-238 mass ratio of 0.372 in the igneous rock, the estimated age of the rock is approximately 2.2 billion years.
What are two things that characterize the practice of science
For this ionic compound, what would be the name of the anion? KMnO4 A. potassite B. potassiate C. permanganite D. permanganate
In the ionic compound KmNO₄, the name of the anion is permanganate. Therefore, option D is correct.
Ionic compounds are compounds that are composed of ions held together by electrostatic forces called ionic bonds. These compounds are typically formed between a metal cation and a nonmetal anion.
In an ionic compound, the metal cation donates one or more electrons to the nonmetal anion. It results in the formation of positively and negatively charged ions. The attraction between these opposite charges leads to the formation of a stable crystal lattice structure.
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A certain reaction with an activation energy of 205 kj/mol was run at 485 k and again at 505 k . what is the ratio of f at the higher temperature to f at the lower temperature?
Final answer:
The ratio of the frequency of effective collisions for a reaction at higher to lower temperature can be found using the Arrhenius equation, which illustrates that the reaction rate increases with temperature due to more molecules having sufficient energy to overcome the activation energy barrier.
Explanation:
The question revolves around the concept known as the Arrhenius equation, which describes how the rate of a chemical reaction is affected by changes in temperature and activation energy. The ratio 'f' represents the frequency of effective collisions leading to a reaction. The Arrhenius equation suggests that as temperature increases, the rate constant of the reaction also increases because a greater fraction of molecules will have the necessary energy to overcome the activation energy barrier.
To calculate the ratio of the frequency of effective collisions at two different temperatures for a reaction with an activation energy (Ea) of 205 kJ/mol, we use the Arrhenius equation:
K = Ae-(Ea/RT)
Where K is the rate constant, A is the frequency factor, Ea is the activation energy, R is the gas constant (8.314 J/mol K), and T is the temperature in kelvins. By taking the ratio of the rate constants at 505 K and 485 K (K2/K1), we can find the ratio of 'f' at the higher temperature to the lower temperature.
The analysis of the change in reaction mechanism with temperature typically shows that, as seen with a reaction with a lower activation energy of 54 kJ/mol, a temperature increase, even by 10 degrees Celsius, can significantly impact the reaction rate, often doubling it. While the exact ratio of 'f' would require computation, the concept remains that the reaction rate will increase with temperature due to the exponential factor in the Arrhenius equation.
A pure silver ring contains 5.15×1022 silver atoms. how many moles of silver atoms does it contain? express the number of moles to two significant figures.
To find the number of moles of silver atoms in the silver ring, divide the number of particles by Avogadro's number.
Explanation:To find the number of moles of silver atoms in the silver ring, we can use Avogadro's number. Avogadro's number tells us that 1 mole of any substance contains 6.022 x 10^23 particles. In this case, we are given that the silver ring contains 5.15 x 10^22 silver atoms. We can use the following equation:
Number of moles = Number of particles / Avogadro's number
Substituting the given values, we get:
Number of moles = 5.15 x 10^22 silver atoms / (6.022 x 10^23 atoms/mol) ≈ 0.0855 mol ≈ 0.086 mol (rounded to two significant figures)
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Why do scientists need an accurate atomic model? Select one: A. The atom is the most important structure in the universe. B. It allows scientists to predict things about objects that are too small to see. C. Models allow scientists to avoid having to do real experiments. D. The atom cannot be divided into smaller particles.
Answer:
B. It allows scientists to predict things about objects that are too small to see.
Explanation:
Hello,
In science, we're always looking for the study of tinier things as long as we're interested about what the matter is made of. Several atomic models such as Bohr's, Rutherford's, Dalton's and the actual one have been proposed in order for us to understand how the protons, neutrons and electrons are assembled into the atom because they are too small to see (about 0.5 fm) thus, with that better understanding, we can research and develop novel applications for new materials based on the micromolecular behavior of the atom.
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Consider a 20.0 % (m/v) solution. how can this be written as a conversion factor?
How many moles of Co2 are produced when 0.2 moles of sodium carbonate reacts with excess HCl
He concentration of the appetite-regulating hormone ghrelin is about 1.3 × 10-10 m in the blood of a fasting person. how many molecules of ghrelin are in 1 l of blood?
There are approximately 7.81x 10¹³ molecules of ghrelin in 1 liter of blood.
A fasting individual has a very low ghrelin content in their blood, around 1.3 x 10²⁰ moles per litre. Avogadro's number—the number of molecules per mole—can be used to compute ghrelin molecules per litre of blood.
We compute the number of molecules using the formula:
Concentration (mol/L) × Volume (L) × Avogadro's number = Number of molecules.
Change the values:
Number of molecules = [tex]1.3 *10^{-10}\ mol/L * 1 L * 6.022 *10^{23}\ mol/mol.[/tex]
In 1 litre of blood, roughly 7.81 x 10¹³ ghrelin molecules are produced. This exceedingly low value shows how sensitive biological systems are to even tiny quantities of appetite-regulating signalling chemicals like ghrelin.
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To calculate the number of ghrelin molecules in 1 L of blood with a concentration of 1.3 × 10^-10 M, multiply this concentration by Avogadro's number, resulting in approximately 78.3 × 10^13 molecules.
Explanation:The concentration of the appetite-regulating hormone ghrelin is about 1.3 × 10^-10 M in the blood of a fasting person. To find out how many molecules of ghrelin are in 1 L of blood, we can use Avogadro's number, which is 6.022 × 10^23 molecules/mol. Multiplying the molarity of ghrelin by Avogadro's number gives us the total number of ghrelin molecules per liter of blood.
To calculate:
Number of molecules = (Concentration in molarity) × (Avogadro's number)= (1.3 × 10^-10 M) × (6.022 × 10^23 molecules/mol)≈ 78.3 × 10^13 moleculesTherefore, there are approximately 78.3 × 10^13 molecules of ghrelin in 1 liter of blood.
Which of the following best explains why electroplating is a useful process in many industries?
Answer: A.
Explanation: it makes some inexpensive materials look more appealing
How many molecules of carbon dioxide are in 243.6 g of carbon dioxide?
The number of molecules of carbon dioxide present in 243.6 g of carbon dioxide is 3.33 × 10²⁴ molecules
From the question,
We are to determine the number of molecules of carbon dioxide that are in 243.6g of carbon dioxide
First, we will determine the number of moles of carbon dioxide present
Using the formula,
[tex]Number\ of\ moles\ = \frac{Mass}{Molar\ mass}[/tex]
Molar mass of carbon dioxide = 44.01 g/mol
Number of moles of carbon dioxide = [tex]\frac{243.6}{44.01}[/tex]
Number of moles of carbon dioxide = 5.5351 moles
Now, for the number of molecules,
Using the formula,
Number of molecules = Number of moles × Avogadro's constant
Number of molecules = 5.5351 × 6.022 × 10²³
Number of molecules of carbon dioxide = 3.33 × 10²⁴ molecules
Hence, the number of molecules of carbon dioxide present in 243.6 g of carbon dioxide is 3.33 × 10²⁴ molecules
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Jupiter’s moon io was discovered to have high concentrations of sulfur oxides in its atmosphere. this, in combination with research into sulfur oxides relating to pollution on earth, has led to renewed interest in sulfur oxide compounds. one compound discovered on io was the blue disulfur trioxide. write the chemical formula for this compound.
Answer:
[tex]S_2O_3[/tex]
Explanation:
Hello,
Nomenclature, is a powerful tool in chemistry to name chemical compounds to successfully distinguish among the thousands and thousands of existing molecular compounds. In rule to stipulate a chemical name y is via specifying the amount of the composing elements into the molecule, thus, the prefix di, accounts for two atoms and the prefix tri for three (this is related with the valence electrons the element has), in such a way, disulfur trioxide is represented with two sulfur atoms and three oxygen atoms, this is:
[tex]S_2O_3[/tex]
Which would be a novel molecule since the sulfur has been reported to have +2,+4 and +6 as the positive oxidation states which are possible to dovetail with oxygen as it is negative.
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What acid and base are neutralized to give potassium nitrate salt?
32.7 grams of water vapor takes up how many liters at standard temperature and pressure (273 K and 100 kPa)?
4 . suppose you are setting up a reaction that requires an iodide salt and are planning to use sodium iodide. however, at the last minute you find that you are out of sodium iodide, so you must use potassium iodide instead. will you need to weigh out more, less, or the same mass of potassium iodide in order to get the same number of moles of iodide ions?
when this chemical equation is correctly balanced what is the coefficient of the nal molecule I2+Na2S2O3+Nal+Na2S4O6
Correctly balancing a chemical equation involves adding coefficients to ensure the number of atoms for each element is equal on both sides. As the given equation has a typo, a general method for balancing equations and an example with sodium and chlorine was described.
The question asks about balancing a particular chemical equation to find the coefficient of NaI. However, the given equation seems to have a typographical error and is not complete. In the context of this question, let's address a general approach on how to balance a chemical equation:
Write down the unbalanced equation.
Determine the number of atoms of each element in the reactants and products.
Adjust coefficients (not subscripts) to get the same number of atoms of each element on both sides.
Repeat steps until all elements are balanced.
Check to ensure that the total charge is the same on both sides if the equation includes ionic species.
For example, the equation for the reaction of sodium (Na) with chlorine gas (Cl2) to form sodium chloride (NaCl) is balanced by placing a '2' in front of Na and NaCl:
2 Na (s) + Cl₂ (g) → 2 NaCl (s)
In this balanced equation, we see that the number of sodium and chlorine atoms are equal on both sides, confirming that the equation is correctly balanced.
After ensuring the equipment is turned off and unplugged what is the next step in cleaning large equipment by hand
How many grams of water are needed to dissolve 27.8 g of ammonium nitrate?
A jogger runs 107 yd in 10.00 seconds. What would be his time for a 483 m run at the same rate?
The jogger's speed is first converted to meters per second, and then the time for the 483-meter run is calculated using the speed and the formula time = distance/speed, resulting in approximately 49.38 seconds.
The student's question involves converting units and calculating time based on a given rate of speed. The jogger runs 107 yards in 10.00 seconds, and we need to determine the time it would take for a 483-meter run at the same rate.
Since 1 yard is roughly equivalent to 0.9144 meters, the jogger's speed in meters per second (m/s) can be calculated as: (107 yards × 0.9144 m/yard) / 10 s = 9.77928 m/s.
Now, to find the time for a 483-meter run at the same speed, we use the equation time = distance/speed, which gives us: 483 m / 9.77928 m/s = approximately 49.38 seconds.
A golf ball and bowling ball are moving and both have the same kinetic energy.Which one is moving faster? If they move at the same speed, which one has more kinetic energy?
What term describes a mixture of 42 percent gold, 20 percent silver, and 38 percent copper?
a) solute
b) alloy
c) solvent
d) electrolyte
Calculate the standard emf of a cell that uses the mg/mg2+ and cu/cu2+ half-cell reactions at 25 °c. write the equation for the cell reaction that occurs under standard-state conditions and write the line notation for the cell.
The cell reaction that occurs is as follows:
[tex]\boxed{{\text{Mg + C}}{{\text{u}}^{{\text{2 + }}}} \rightleftarrows {\text{M}}{{\text{g}}^{2 + }}{\text{ + Cu}}}[/tex]
The line notation of cell is as follows:
[tex]\left. {{\text{Mg}}\left( {\text{s}} \right)} \right|{\text{M}}{{\text{g}}^{2 + }}\left( {{a_{{\text{M}}{{\text{g}}^{2 + }}}}} \right)\left\| {{\text{C}}{{\text{u}}^{2 + }}\left( {{a_{{\text{C}}{{\text{u}}^{2 + }}}}} \right)\left| {{\text{Cu}}\left( {\text{s}} \right)} \right.} \right.[/tex]
The standard emf value of the cell is [tex]\boxed{2.7{\text{ V}}}[/tex].
Further Explanation:
Redox reaction:
It is a type of chemical reaction in which the oxidation states of atoms are changed. In this reaction, both reduction and oxidation are carried out at the same time. Such reactions are characterized by the transfer of electrons between the species involved in the reaction.
The general representation of a redox reaction is,
[tex]{\text{X}} + {\text{Y}} \to {{\text{X}}^ + }+{{\text{Y}}^ - }[/tex]
The oxidation half-reaction can be written as:
[tex]{\text{X}} \to {{\text{X}}^ + } + {e^ - }[/tex]
The reduction half-reaction can be written as:
[tex]{\text{Y}} + {e^ - } \to {{\text{Y}}^ - }[/tex]
Here, X is getting oxidized and its oxidation state changes from to +1 whereas B is getting reduced and its oxidation state changes from 0 to -1.
The element which has higher oxidation potential is oxidized at anode and the element with the less oxidation potential is reduced at cathode in the cell.
The standard oxidation potential for [tex]{\text{Mg/M}}{{\text{g}}^{2 + }}[/tex] is [tex]+ 2.363{\text{ V}}[/tex].
The standard oxidation potential for [tex]{\text{Cu/C}}{{\text{u}}^{2 + }}[/tex] is [tex]- 0.337{\text{ V}}[/tex].
Since [tex]{\text{Mg}}[/tex] has higher oxidation potential thus the oxidation of [tex]{\text{Mg}}[/tex] takes place at anode and reduction of [tex]{\text{C}}{{\text{u}}^{2 + }}[/tex] takes place at cathode.
The oxidation half-reaction of [tex]{\text{Mg/M}}{{\text{g}}^{2 + }}[/tex] can be written as:
[tex]{\text{Mg}} \to {\text{M}}{{\text{g}}^{2 + }} + 2{e^ - }[/tex] ......(1)
The reduction half-reaction [tex]{\text{Cu/C}}{{\text{u}}^{2 + }}[/tex] can be written as:
[tex]{\text{C}}{{\text{u}}^{2 + }} + 2{e^ - } \to {\text{Cu}}[/tex] ......(2)
Add reaction (1) and (2) and eliminate common terms to determine the net reaction for the given cell.
[tex]{\text{Mg + C}}{{\text{u}}^{{\text{2 + }}}} \rightleftarrows {\text{M}}{{\text{g}}^{2 + }}{\text{ + Cu}}[/tex] ......(3)
The expression of the cell is written as follows:
[tex]\left. {{\text{Mg}}\left( {\text{s}} \right)} \right|{\text{M}}{{\text{g}}^{2 + }}\left( {{a_{{\text{M}}{{\text{g}}^{2 + }}}}} \right)\left\| {{\text{C}}{{\text{u}}^{2 + }}\left( {{a_{{\text{C}}{{\text{u}}^{2 + }}}}} \right)\left| {{\text{Cu}}\left( {\text{s}} \right)} \right.} \right.[/tex] ......(4)
The expression to calculate the standard emf of the cell is as follows:
[tex]E_{{\text{cell}}}^0 = E_{{\text{anode}}}^0 - E_{{\text{cathode}}}^0[/tex] ......(5)
Substitute [tex]+ 2.363{\text{ V}}[/tex] for [tex]E_{{\text{anode}}}^0[/tex] and [tex]- 0.337{\text{ V}}[/tex] for [tex]E_{{\text{cathode}}}^0[/tex] in equation (5).
[tex]\begin{aligned}E_{{\text{cell}}}^0&=\left({ + 2.363{\text{ V}}}\right)-\left( { - 0.337{\text{ V}}} \right)\\&= 2.7{\text{ V}}\\\end{aligned}[/tex]
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Electrochemistry
Keywords: Mg/M2+, Cu/Cu2+, half-cell reaction, standard emf of the cell, oxidation state, reduction, oxidation, redox reaction, transfer of electrons, reducing agents, oxidizing agents.
To calculate the standard emf of a cell with Mg/Mg2+ and Cu/Cu2+ at 25 °C, subtract the anode potential (-2.37 V) from the cathode potential (+0.34 V) to get +2.71 V, indicating a spontaneous reaction. The line notation for the cell is Mg(s) | Mg2+(aq) || Cu2+(aq) | Cu(s).
Explanation:To calculate the standard emf of a cell using the Mg/Mg2+ and Cu/Cu2+ half-cell reactions at 25 °C, we use the standard reduction potentials from the electrochemical series. The standard reduction potential for the Mg2+ to Mg half-cell is -2.37 V and for the Cu2+ to Cu half-cell is +0.34 V. Because oxidation occurs at the anode and reduction at the cathode, the Mg/Mg2+ cell will act as the anode and the Cu/Cu2+ cell as the cathode.
The overall cell reaction, under standard conditions, is derived by combining the half-reactions:
Mg(s) -> Mg2+(aq) + 2e- (Oxidation)
Cu2+(aq) + 2e- -> Cu(s) (Reduction)
When combined, the overall reaction is:
Mg(s) + Cu2+(aq) -> Mg2+(aq) + Cu(s)
The standard cell potential (Ecell) is calculated by taking the difference between the standard reduction potentials of the cathode and anode:
Ecell = Ecathode(red) - Eanode(ox) = 0.34 V - (-2.37 V) = +2.71 V
The positive value of Ecell indicates that the reaction is spontaneous under standard conditions. The line notation for the cell is:
Mg(s) | Mg2+(aq) || Cu2+(aq) | Cu(s)
A solid is placed in a solution. Which observation most likely indicates that a chemical reaction has occurred?
Which pair of atoms would form a covalent bond ?
calcium (Ca) and bromine (Br)
rubidium (Rb) and sulfur (S)
cesium (Cs) and nitrogen (N)
oxygen (O) and chlorine (Cl)
oxygen (O) and chlorine (Cl)
Explanation:As the electronegativity of an element increases It is more likely to make an ionic bond. e.g. the metallic elements. On the moderate values of electronegativity, elements tend to make covalent bond.
Oxygen and chlorine will make covalent bond because the electronegativity difference between these two elements is 0,5 so there bond will be covalent in nature.
what are the common parts of nucleotide?
What is the maximum mass of s8 that can be produced by combining 87.0 g of each reactant? 8so2+16h2s=3s8+16h20?
To find the maximum mass of S8 produced, we first convert mass of the reactants to moles, then use stoichiometry to find the amount of S8 each can produce. The reactant that produces the least S8 is the limiting reactant. Finally, we convert the moles of S8 to grams.
Explanation:The calculation for maximum mass of S8 that can be produced in the reaction 8SO2 + 16H2S = 3S8 + 16H2O, first requires understanding of how to use stoichiometry and limiting reactants concept. We start by converting the given mass of the reactants (87.0 g) to moles using their molar mass. For SO2, it's 64 g/mol and for H2S, it's 34 g/mol. We get 1.36 mol of SO2 and 2.56 mol of H2S.
Then, by using the stoichiometric coefficients present in the balanced equation, we'll find the amount of S8 that can be produced by each reactant. The limiting reactant is the one which produces least amount of product. In this case, it's SO2. Finally, we convert the moles of S8 to grams using its molar mass (256 g/mol).
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when 42.66 grams of PCl5 react with excess P4O10 the amount of product formed is 47.22 grams of POCl3. What is the percent yield
Percent yield or yield is mathematically defined as:
Yield = Actual amount / Theoretical amount
So to solve the yield, let us first calculate the theoretical amount of POCl3 produced. The balanced chemical reaction for this is:
6 PCl5 + P4O10 ---> 10 POCl3
Since P4O10 is stated to be supplied in large amount, then PCl5 becomes the limiting reactant.
So we calculate for POCl3 based on PCl5. To do this let us convert the amount into moles: (molar mass PCl5 = 208.24 g/mol)
n PCl5 = 42.66 grams / (208.24 g/mol)
n PCl5 = 0.205 mol
Now based on the stoichiometric ratio of the reaction:
n POCl3 = 0.205 mol (10
POCl3 / 6 PCl5)
n POCl3 = 0.3414 mol POCl3
Converting to mass (molar mass POCl3 = 153.33 g/mol)
m POCl3 = 0.3414 mol (153.33 g/mol)
m POCl3 = 52.35 g
Calculating for yield:
Yield = 47.22 g/ 52.35 g
Yield = 0.902
%Yield = 90.2 % (ANSWER)
The percent yield of POCl₃ is calculated by dividing the actual yield (47.22 grams) by the theoretical yield (52.36 grams), then multiplying by 100 to obtain a percent yield of 90.18%.
To calculate the percent yield of POCl₃, we first need the balanced chemical equation for the reaction between PCl₅ and P₄O₁₀. The equation is:
6 PCl₅ + P₄O₁₀ → 10 POCl₃
Next, we will convert the mass of PCl₅ to moles:
Molar mass of PCl₅ = 208.24 g/mol
Moles of PCl₅ = 42.66 g / 208.24 g/mol = 0.2049 moles
Using the stoichiometry of the balanced equation, we calculate the theoretical yield of POCl₃:
For every mole of PCl₅, (10/6) moles of POCl₃ are produced. Therefore, the moles of POCl₃ produced from 0.2049 moles of PCl₅ are:
Moles of POCl₃ = 0.2049 moles PCl₅ × (10/6) = 0.3415 moles
Molar mass of POCl₃ = 153.33 g/mol
Theoretical yield of POCl₃ = 0.3415 moles × 153.33 g/mol = 52.36 grams
Now, we can calculate the percent yield:
Percent yield = (Actual yield / Theoretical yield) × 100
Percent yield = (47.22 g / 52.36 g) × 100 = 90.18%
Therefore, the percent yield of POCl₃ is 90.18%.