Answer: 24 moles of [tex]SnF_2[/tex] are produced.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]{\text{Moles of} H_2}=\frac{48g}{2g/mol}=24moles[/tex]
[tex]Sn+2HF\rightarrow SnF_2+H_2[/tex]
According to stoichiometry :
1 mole of [tex]H_2[/tex] is accompanied with = 1 mole of [tex]SnF_2[/tex]
Thus 24 moles of [tex]H_2[/tex] is accompanied with =[tex]\frac{1}{1}\times 24=24moles[/tex] of [tex]SnF_2[/tex]
Thus 24 moles of [tex]SnF_2[/tex] are produced.
Why is the C-14/C-12 ratio used to date once-living organisms?
The C-14/C-12 ratio is used to date once-living organisms because C-12 is fixed value of any organisms but the value of C-14 is constantly decreasing by time and so every organism have their specific ratio of C14/C12 .
What do you mean by C-14 and C-12 isotope ?Carbon-12 and carbon-14 are two isotopes of the element carbon. The difference between carbon-12 and carbon-14 is the number of neutrons in each of their atoms.
Because of the different number of neutrons, carbon-12 and carbon-14 differ in terms of radioactivity. Carbon-12 is a stable isotope carbon-14, on the other hand, undergoes radioactive decay:
146C → 147N + 0-1e
C-12 is fixed value of any organisms but the value of C-14 is constantly decreasing by time and so every organism have their specific ratio of C14/C12 ,hence due to this reason the C-14/C-12 ratio used to date once-living organisms .
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Final answer:
The C-14/C-12 ratio is used to date once-living organisms by comparing the ratios in living and deceased organisms to calculate the age.
Explanation:
The C-14/C-12 ratio is used to date once-living organisms because after death, the C-14 isotope decays at a known rate, leading to a decrease in the ratio. By comparing this ratio to the ratio in living organisms, scientists can determine the age of the once-living organism by calculating the number of half-lives that have passed.
Which of the following is a property of an acid?
1. Acids become slippery when dissolved in water.
2. Acids react with metals to form hydrogen gas.
3. Acids produce salts when mixed with other acids.
4. Acids become more acidic when mixed with a base.
What are all substances made of?
Answer:
Atoms
Explanation:
Substances are made up of millions of atoms that make up of molecules, then particles, until a matter is in shape.
Answer:
substances made of atoms or molecules
Explanation:
these atoms and molecules can be combined using chemical bonding or without chemical bonding
difference between exothermic chemical reaction and endothermic chemical reaction
Explanation:
exothermic reaction is a chemical reaction which involves the liberation of heat to the surroundings while endothermic reaction is a chemical reaction that involves the absorption of heat from the surroundings
Answer:
Exothermic= outside
Endothermic= inside
Explanation:
Time (s) [NO2] (mol/L) 0 0.500 1,200 0.444 3,000 0.381 4,500 0.340 9,000 0.250 (Note: The rate law only depends on the concentration of NO2.) Consider the reaction NO2(g) + CO(g) → NO(g) + CO2(g). The data in the table was obtained by observing the reaction. What is the order of this reaction? A. zero order B. first order C. second order D. third order
Answer:
C on plato good luck
Explanation:
Please show all of your work! :)
Answer:
B
Explanation:
Since we want to find the volume of CO, but we're given Nickel's mass, we need to convert grams of Nickel to moles then convert that to moles of CO using stoichiometry from the balanced reaction.
The molar mass of Nickel is 58.69 g/mol:
[tex]18.9 g Ni *\frac{1mol}{58.69gNi} =0.322molNi[/tex]
From the reaction, we can see that each mole of Nickel is 4 moles of CO, so to find the number of moles of CO from 0.322 moles of Nickel, multiply 0.322 by 4: 0.322 * 4 = 1.29 mol CO
Now, we can use the ideal gas law, PV = nRT, to find the volume of CO:
- the pressure P is 2.99 atm
- the volume is what we want to find
- the moles n is 1.29 mol CO
- the gas constant R here would be 0.08206 L atm / (mol K)
- the temperature T is 340.°C + 273 = 613 K
Plug all these values in:
PV = nRT
(2.99 atm) * V = (1.29 mol) * (0.08206) * (613 K)
V ≈ 21.7 L
The answer is B
Which of these formulas contain equal numbers of nitrogen atoms?
I. CO(NO3)2
II. (NH2)2CO,
III. (NH),PO,
IV. AI(NO3)2
V. NH.NO,
A
Formulas I and III
B
Formulas I and IV
C
Formulas II and III
D
Formulas I, II, and v
Answer:
Its D
Explanation:
Because 1 nitrogen atom is N2 and theres an N2 in all of those
Formulas I, II, and III each contain an equal number of nitrogen atoms.
Explanation:To determine which formulas contain an equal number of nitrogen atoms, we need to count the number of nitrogen atoms in each formula.
Formula I: CO(NO3)2 - This formula has 2 nitrogen atoms.Formula II: (NH2)2CO - This formula has 2 nitrogen atoms.Formula III: (NH4)2PO - This formula has 2 nitrogen atoms.Formula IV: Al(NO3)3 - This formula has 3 nitrogen atoms.Formula V: NH4NO2 - This formula has 1 nitrogen atom.From the count, we can see that formulas I, II, and III each contain an equal number of nitrogen atoms.
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How many grams of NH4Cl (ammonium chloride) should dissolve in 50mL of water at 20 degrees Celsius?
Answer:
about 19 or 20 g
Explanation:
To do this, is neccesary to watch a solubility curve of this compound. This is the only way that you can know how many grams are neccesary to dissolve this compound in 50 mL of water to a given temperature.
Now, if you watched the attached graph, you can see the solubility curve of many compounds in 100 g of water (or 100 mL of water). So, to know how many do you need in 50 mL, it's just the half.
So watching the curve, you can see that at 20 °C, we simply need between 35 g and 40 g. Let's just say we need 38 grams of NH4Cl to be dissolved in 100 mL of water.
So, in 50 mL, it's just the half. So, we only need 19 g or 20 g of NH4Cl at 20 °C, to dissolve this compound in water.
1. Construct Explanations How does the time at which you see things
happen at a baseball game compare to the time when you hear things
happen? Explain your answer.
Answer:
You see things happen much sooner than you hear them.
Explanation:
Light travels about a million times as fast as sound.
When the ball hits the bat , it will take about a million times longer to hear the crack of the bat than to see it.
What you see is almost instantaneous.
There will be a delay until you hear the sound.
How does deforestation (cutting trees down), affect carbon dioxide levels in the atmosphere?
A. Trees have no effect on carbon dioxide in the air.
B. When they are cut down they no longer absorb carbon dioxide, increasing the levels in the atmosphere.
C. When they are cut down they no longer produce carbon dioxide, decreasing the levels in the atmosphere.
D. When each tree is cut down, they release a large burst of carbon dioxide, increasing the levels in the atmosphere.
Deforestation leads to increased carbon dioxide levels in the atmosphere by preventing trees from absorbing it and releasing stored carbon dioxide back into the air.
Explanation:Deforestation significantly impacts carbon dioxide levels in the atmosphere. When trees are cut down, they can no longer remove carbon dioxide from the atmosphere, leading to an increase in carbon dioxide levels. Additionally, burning trees releases stored carbon dioxide back into the atmosphere, further contributing to the greenhouse effect and climate change.
The molar absorptivity of Beta-carotene at 490 nm is 1.36 x 105 M-1cm-1. What is the concentration of a solution of Beta-carotene that has an absorbance, A490 = 140 in a cell with a path length of 1 cm? The molar absorptivity of Beta-carotene at 490 nm is 1.36 x 105 M-1cm-1. What is the concentration of a solution of Beta-carotene that has an absorbance, A490 = 140 in a cell with a path length of 1 cm? 2.5 x 10-4 M 5.0 x 10-4 M 1.3 x 10-4 M 2.0 x 10-3 M 1.0 x 10-3 M?
Answer:
The correct answer to the following question will be Option E (1.0 x 10⁻³ M).
Explanation:
The given values are:
[tex]A\lambda =140[/tex]
[tex]\varepsilon=1.36\times 10^5 \ M \ {cm^{-1}}[/tex]
L = 1 \ cm
As we know,
⇒ [tex]A\lambda=\varepsilon CL[/tex]
On putting the given values in the above formula, we get
⇒ [tex]140=1.36\times 10^5\times C\times 1[/tex]
⇒ [tex]C=\frac{140}{1.36\times 10^5}[/tex]
⇒ [tex]C=102.9\times 10^{-5} \ M[/tex]
So that option E is the right answer.
The concentration of a Beta-carotene solution with an absorbance of 140 at a path length of 1 cm is calculated as approximately 1.0 x 10⁻³ M using the Beer-Lambert law.
The question is asking for the concentration of a Beta-carotene solution based on its absorbance at a wavelength of 490 nm using the Beer-Lambert law. According to the Beer-Lambert law, absorbance (A) is equal to the molar absorptivity () times the concentration of the solution (c) times the path length (b):
A = c b
Given the values:
Absorbance (A) = 140
Molar absorptivity () = 1.36 x 105 M⁻¹cm⁻¹
Path length (b) = 1 cm
We can rearrange the equation to solve for concentration (c):
c = A / (b)
Plugging in the given values:
c = 140 / (1.36 x 105 x 1)
Concentration (c) = 1.0294117647 x 10⁻³ M, which can be approximated to 1.0 x 10⁻³ M based on the given options.
Hence, the concentration of Beta-carotene solution with an absorbance of 140 at a path length of 1 cm is 1.0 x 10⁻³ M.
How much force is required to lift a 100kg barbell with an acceleration of 3 m/s2?
Answer:
300N
Explanation:
Mass = 100kg
Acceleration = 3m/s²
Force = mass × acceleration
F = ma
Force = 100 × 3
Force = 300N
The force required to move 100kg of barbell with an acceleration of 3m/s² is 300N
The convection that causes Earth's magnetic field happens in Earth's
Answer:
Earth's Core!
a. If 42.5 g of CH3OH reacts with 22.8 L of O2 at 27°C and a pressure of 2.00 atm, calculate the number of grams of water vapor and the volume of water vapor that would be formed at the same temperature and pressure.
Answer:
The mass of water vapor is 44.46 grams
The volume of water is 30.37 L
Explanation:
Step 1: Data given
Mass of CH3OH =42.5 grams
Molar mass CH3OH = 32.04 g/mol
Volume of O2 = 22.8 L
Pressure = 2.00 atm
Step 2: The balanced equation
2CH3OH + 3O2 → 2CO2 + 4H2O
Step 3: Calculate moles CH3OH
Moles CH3OH = mass CH3OH / molar mass CH3OH
Moles CH3OH = 42.5 grams / 32.04 g/mol
Moles CH3OH = 1.326 moles
Step 4: Calculate moles O2
p*V = n*R*T
⇒with p = the pressure = 2.00 atm
⇒with V = the volume of O2 = 22.8 L
⇒with n = the moles of O2 = TO BE DETERMINED
⇒with R = the gas constant = 0.08206 L*Atm/mol*K
⇒with T = the temperature = 27 °C = 300 K
n = (p*V) / (R*T)
n = (2.00 * 22.8) / (0.08206*300)
n = 1.85 moles
Step 5: Calculate the limiting reactant
For 2 moles CH3OH we need 3 moles O2 to produce 2 moles CO2 and 4 H2O
O2 is the limiting reactant. It will completely be consumed ( 1.85 moles). CH3OH is in excess. There will react 2/3*1.85 = 1.233 moles. There will remain 1.326 - 1.233 = 0.093 moles
Step 6: Calculate moles products
For 2 moles CH3OH we need 3 moles O2 to produce 2 moles CO2 and 4 H2O
For 1.85 moles O2 we'll have 1.233 moles CO2 and 2.467 moles H2O
Step 7: Calculate mass H2O
Mass H2O = moles H2O * molar mass H2O
Mass H2O = 2.467 moles * 18.02 g/mol
Mass H2O = 44.46 grams
Step 8: Calculate volume H2O
p*V = n*R*T
⇒with p = the pressure = 2.00 atm
⇒with V = the volume of H2O = TO BE DETERMINED
⇒with n = the moles of H2O = 2.467 moles
⇒with R = the gas constant = 0.08206 L*Atm/mol*K
⇒with T = the temperature = 27 °C = 300 K
V = (n*R*T)/p
V = (2.467 * 0.08206 * 300) / 2.00
V = 30.37 L
The mass of water vapor is 44.46 grams
The volume of water is 30.37 L
Identify whether the statement is true or false, and why? “Global temperatures have risen in the past, the reason they are dangerous now is because of how fast the change is happening.”
A. False, it should read “Global temperatures have risen in the past, so there is no danger that they are rising now.”
B. False, it should read “Global temperatures have risen in the past, the reason they are dangerous now is because of how slowly the change is happening.”
C. False, it should read “Global temperatures have not risen in the past, so it is very dangerous that this change is happening.”
D. True
Answer:
c
Explanation:
False, it should read “Global temperatures have not risen in the past, so it is very dangerous that this change is happening.” Hence, option C is correct.
What are global temperatures?Global warming is defined in this report as an increase in combined surface air and sea surface temperatures averaged over the globe and over a 30-year period.
Though natural cycles and fluctuations have caused the earth's climate to change several times over the last 800,000 years, our current era of global warming is directly attributable to human activity—specifically to our burning of fossil fuels such as coal, oil, gasoline, and natural gas
Hence, option C is correct.
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name 3 uses for mercury
hydrargyrum , hg swiftplanet, quicksliver
Explanation:
Answer:
Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices, though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor ...
Explanation:
i know this will help because i got this right
If you make a solution that has a H+ concentration of 0.075, what
will the pH of the solution be?
Answer:
1.125
Explanation:
pH = -log[H+]
pH = -log(0.075)
pH = 1.125
Which element, Phosphorus or Calcium, is more reactive? Why?
Answer:
phosphorus is more reactive than calcium
Explanation:
Which of the following forms a water solution that will conduct electricity?
F. CaCl2
G. CO2
H. NO2
J. SiF4
Answer: F. CaCl2
Explanation:
Calcium Chloride (CaCl2) is an ionic compound. In an aqueous state,this compound is a good conductor of electricity.
What can you predict from an element's location on the periodic table?
it's properties
it's chemical name
it's chemical symbol
when it was discovered
Answer:
properties
Explanation:
the location on the periodic table can indicate periodic trends such as electronegativity, ionization energy and also the proton amount of the element.
Final answer:
The periodic table allows predictions about an element's properties and behavior based on its location. The group number indicates valence electrons and chemical reactivity, and elements in the same group share similar chemical properties. The periodic table also provides insights into atomic radius, ionization energies, electron affinities, and electronegativity.
Explanation:
The periodic table provides valuable information about an element's properties and behavior. The number of valence electrons, which determines an element's reactivity, can be determined by its group number on the periodic table. Elements in the same group often have similar chemical properties. Additionally, the location of an element on the periodic table can provide insights into its atomic radius, ionization energies, electron affinities, and electronegativity.
if the base concentration was 3.0 M, determine the unknown concentration of the sulfuric acid. please answer asap !!!!
Answer:
The concentration of sulfuric acid would be 3.6 M.
Explanation:
10. If 32.4 mole of CO react with excess Fe2O3, how many moles of Fe will form?
Answer: 21.6 mol of Fe
Explanation:
Fe2O3 + 3 CO → 2 Fe + 3 CO2
32.4 mol CO x __2 mol Fe__ = 21.6 mol of Fe
3 mol CO
how many atoms of lead are there in 10.0 g of lead?
Answer:
The number of atoms in 10 g of Pb is 2.9064 × 10²² atoms
Explanation:
According to Avogadro's constant, one mole of a substance contains exactly 6.02214076 × 10²³ particles such as molecules, atoms or ions.
Here we have lead, Pb, which is an uncombined element, therefore, the number of moles present in 10 g of lead can be found as follows;
Molar mass of lead = 207.2 g/mol
Mass of lead sample = 10 g
[tex]Number \, of \, moles, \, n, \, of \, lead \, present = \frac{Mass \, of \, lead}{Molar \, mass \, of \, lead} = \frac{10 \, g}{207.2 \, g/mol} = 0.04826 \ moles[/tex]
Therefore, number of atoms in 10 g of lead is found by multiplying the number of moles by the Avogadro's number as follows;
Number of atoms = Number of moles × Avogadro's number
∴ Number of atoms in 10 g of Pb = 0.04826 × 6.02214076 × 10²³ = 2.9064 × 10²² atoms.
The number of atoms in 10 g of Pb = 2.9064 × 10²² atoms.
Answer:
2.9 ×10^22 atoms of lead.
Explanation:
Now, we have to make use of the Avogadro's number. Remember that according to professor Avogadro, the mole refers to the amount of substance that contains the same number of elementary entities as 12 grams of carbon-12.
The number of elementary particles (atoms, ions, molecules etc) present is one mole of a substance is equal to the Avogadro's number. Hence one mole of a substance contains Avogadro's number of elementary entities.
Now one mole of lead has a mass of 207.2 gmol-1. One mole of lead contains 6.02×10^23 atoms (Avogadro's number) of atoms.
Hence if 207.2 g of lead contains 6.02×10^23 atoms of lead
10.0 g of lead will contain 10.0 × 6.02×10^23 / 207.2 = 2.9 ×10^22 atoms of lead.
Hence 10.0g of lead contains 2.9 ×10^22 atoms of lead.
Which condition causes a hurricane to rotate?
Answer:
its caused by the convection of air masses with differences in densities mainly due to their differences in temperatures.
-Hops
A standard hydrogen atom has how many neutrons?
A. 0
B. 3
C. 2
D. 1
Answer:
D. 1
Explanation:
Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.
Answer:
D.1 is the correct answer
Explanation:
The only positive ion found in H2SO4(aq) is the
(1) ammonium ion (3) hydroxide ion
(2) hydronium ion (4) sulfate ion
Final answer:
The positive ion found in aqueous sulfuric acid (H2SO4) is the hydronium ion (H3O+), which forms during the acid's ionization in water.
Explanation:
The positive ion found in H2SO4(aq) is the hydronium ion (H3O+). When sulfuric acid (H2SO4) is dissolved in water, the first ionization results in the formation of hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−). The second ionization of the hydrogen sulfate ion can produce more hydronium ions and sulfate ions (SO42−). Since we are discussing only positive ions, the hydronium ion is the relevant ion in both ionization steps of sulfuric acid in an aqueous solution.
The ammonium ion (NH4+), sulfide ion (S2−), and hydroxide ion (OH−) are not relevant in the context of sulfuric acid in aqueous solution.
In aqueous sulfuric acid, the only positive ion present is the 2. hydronium ion (H₃O⁺).
In the aqueous solution of sulfuric acid, H₂SO₄(aq), the only positive ion that is found is the hydronium ion (H₃O⁺).
When sulfuric acid (H₂SO₄) is dissolved in water, it undergoes ionization:
First ionization: H₂SO₄(aq) + H₂O(l) ⇒ H₃O+(aq) + HSO₄⁻(aq)
Second ionization: HSO₄⁻(aq) + H₂O(l) ⇒ H₃O⁺(aq) + SO₄²⁻(aq)
This ionization process results in the formation of hydronium ions (H₃O⁺), making them the only positive ions in the solution. The correct answer is 2.
150 units of chemical energy were converted into 35 units of thermal energy, 5 units of sound energy,
and x units of radiant energy. What is the value of x?
A. 190
OB. 40
O
C.
110
O
D.
100
Answer:
110
Explanation:
Find the pH of a solution that contains 3.25 g of H2SO4 (MM= 98.08 g/mol) dissolved in 2.75 liters of solution. (Hint diprotic acid)
Answer:
the ph is 13.54
ur welcome
Explanation:
Based on the data provided, the pH of the H2SO4 solution is 1.62
What is pH of a solution?The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution .
Mathematically, pH = - log [H+]
The pH is calculated from the molarity of the solution.
Molarity = number of moles/volume in Litres moles = mass/molar massnumber of moles of H2SO4 = 3.25/98.08 = 0.0331 moles
Molarity of the H2SO4 solution = 0.0331/2.75 = 0.012 M
Since H2SO4 us a diprotic acid, [H+] = 2 × 0.012 = 0.024
Then;
pH = -log(0.024)
pH = 1.62
Therefore, the pH of the H2SO4 solution is 1.62
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9. Mr. James owns 12 gas stations in Newport News. He wants to build a
new gas station on the same block that already has a gas station. There
are 3 other different gas stations near by. He thinks it will allow the
community to have a choice as to which gas to use. What type of
viewpoint does Mr. James have? *
preservationist viewpoint
conservationist viewpoint
developmental viewpoint
Mr. James holds a developmental viewpoint. This perspective prioritizes progress, growth, and expansion, often with a focus on economic development and maximizing opportunities for growth and profit.
In Mr. James' case, his decision to build a new gas station in an area already serviced by existing gas stations reflects a desire for development and expansion of his business ventures. He sees the construction of a new gas station as a means to increase accessibility and choice for the community, potentially attracting more customers and generating additional revenue.
From a developmental viewpoint, Mr. James likely perceives the addition of a new gas station as beneficial for the community, offering consumers more options and fostering competition among gas providers. He may believe that competition will lead to better services, lower prices, and improved overall customer satisfaction.
Additionally, Mr. James may view the construction of a new gas station as a way to contribute to the economic growth and development of the area. The establishment of new businesses can create job opportunities, stimulate local economies, and contribute to the overall prosperity of the community.
However, it's important to note that while the developmental viewpoint emphasizes progress and growth, it may not always prioritize environmental or conservation concerns. In Mr. James' case, the decision to build a new gas station may have implications for environmental sustainability, such as increased pollution or depletion of natural resources, which are factors that conservationists may be more inclined to consider.
Overall, Mr. James' decision to build a new gas station reflects a developmental viewpoint focused on growth, expansion, and economic development, with the belief that it will benefit both his business and the community at large.
What is the molarity of the solution produced when 85.6 g of hydrochloric acid (HCl) is dissolved in enough water to prepare 385 mL of solution?
Answer:
6.09 M
Explanation:
M(HCl) = 1 +35.5 = 36.5 g/mol
85.6 g * 1 mol/36.5 g = 2.3452 mol HCl
Molarity = mol solute/ L solution = 2.3452 mol/0.385 L = 6.09 mol/L =6.09 M
The number of moles of HCl in 85.6 g is 2.35 moles. Then, the molarity of the 385 ml or 0.385 L solution is 6.10 M
What is molarity ?The molarity of a solution is the ratio of the number of moles of its solutes to the volume of solution in liters. It is the common term to express the concentration of a solution.
To find the molarity of the solution, we need to first calculate the number of moles of HCl in the solution, using the formula:
moles = mass / molar mass
where mass is the mass of the solute (hydrochloric acid) and molar mass is the molecular weight of the solute.
The molecular weight of HCl is approximately 36.5 g/mol (1.008 g/mol for hydrogen and 35.5 g/mol for chlorine).
So, the number of moles of HCl in 85.6 g of HCl is:
moles = 85.6 g / 36.5 g/mol = 2.35 mol
Next, we need to calculate the volume of the solution in liters:
385 mL = 0.385 L
Finally, we can calculate the molarity of the solution using the formula:
molarity = moles of solute / liters of solution
molarity = 2.35 mol / 0.385 L ≈ 6.10 M
Therefore, the molarity of the solution produced is approximately 6.10 M.
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