Question 1

A certain compound has a molar mass of 150 g/mol.Which is a possible empirical formula for this compound?

Accepted Answer

A)  CH2O 
B)  CHO 
C)  C2H2O2 
D)  C2HO 
E)  C2H2O 
A)  CH2O 
B)  CHO 
C)  C2H2O2 
D)  C2HO 
E)  C2H2O

Question 2

If the complete combustion of an unknown mass of ethylene produces 16.0 g CO2,what mass of ethylene is combusted?
C2H4(g)+ 3 O2(g)$\to$ 2 CO2(g)+ 2 H2O(g)

Accepted Answer

A)  0.182 g 
B)  0.364 g 
C)  5.10 g 
D)  8.00 g 
E)  12.6 g 
A)  0.182 g 
B)  0.364 g 
C)  5.10 g 
D)  8.00 g 
E)  12.6 g

Question 3

Calculate the number of moles of O2 required to react with phosphorus to produce 4.76 g of P4O6.
(Molar mass P4O6 = 219.9 g/mol)

Accepted Answer

A)  0.0216 mol 
B)  0.149 mol 
C)  0.0649 mol 
D)  0.0433 mol 
E)  0.130 mol 
A)  0.0216 mol 
B)  0.149 mol 
C)  0.0649 mol 
D)  0.0433 mol 
E)  0.130 mol

Question 4

PCl3 can be produced from the reaction of P4 with Cl2.
P4(s)+ 6 Cl2(g)$\to$ 4 PCl3(g)
If 1.00 g P4 reacts with 1.00 g Cl2,which reactant is the limiting reactant? What mass of product may be produced?

Accepted Answer

Chlorine is the limi

Question 5

How many moles of sulfate ions are there in a 0.387-L solution of 0.927 M Al2(SO4)3?

Accepted Answer

A)  0.359 mol 
B)  1.08 mol 
C)  1.25 mol 
D)  0.120 mol 
E)  7.19 mol 
A)  0.359 mol 
B)  1.08 mol 
C)  1.25 mol 
D)  0.120 mol 
E)  7.19 mol

Question 6

A 1.850 g mixture of SrCO3 and SrO is heated.The SrCO3 decomposes to SrO and CO2.What was the mass percentage of SrCO3 in the mixture if the mass after heating is 1.445 g?

Accepted Answer

A)  26.6% 
B)  21.9% 
C)  13.7% 
D)  73.4% 
E)  78.1% 
A)  26.6% 
B)  21.9% 
C)  13.7% 
D)  73.4% 
E)  78.1%

Question 7

A 1.185 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 2.264 g CO2 and 1.390 g H2O.What mass of oxygen is contained in the original sample?

Accepted Answer

A)  0.4117 g 
B)  0.5673 g 
C)  1.079 g 
D)  0.8733 g 
E)  0.2053 g 
A)  0.4117 g 
B)  0.5673 g 
C)  1.079 g 
D)  0.8733 g 
E)  0.2053 g

Question 8

The empirical formula of ethylene is CH2.An experimental determination of the molar mass of ethylene yields the value of 28 g/mol.What is the $\underline{\text{  molecular  }}$ formula of ethylene?

Accepted Answer

A)  C5H10 
B)  CH2 
C)  C2H4 
D)  C3H8 
E)  C6H9 
A)  C5H10 
B)  CH2 
C)  C2H4 
D)  C3H8 
E)  C6H9

Question 9

A mass of 0.4113 g of an unknown acid,HA,is titrated with NaOH.If the acid reacts with 28.10 mL of 0.1055 M NaOH(aq),what is the molar mass of the acid?

Accepted Answer

A)  2.965 $\times$ 10-3 g/mol 
B)  9.128 g/mol 
C)  138.7 g/mol 
D)  337.3 g/mol 
E)  820.7 g/mol 
A)  2.965 $\times$ 10-3 g/mol 
B)  9.128 g/mol 
C)  138.7 g/mol 
D)  337.3 g/mol 
E)  820.7 g/mol

Question 10

If 48.8 g of O2 is mixed with 48.8 g of H2 and the mixture is ignited,what is the maximum mass of water that may be produced?

Accepted Answer

A)  439 g 
B)  54.9 g 
C)  48.8 g 
D)  98 g 
E)  86.8 g 
A)  439 g 
B)  54.9 g 
C)  48.8 g 
D)  98 g 
E)  86.8 g

Question 11

Sulfur hexafluoride is produced by reacting elemental sulfur with fluorine gas.S8(s)+ 24 F2(g)$\to$ 8 SF6(g)
What is the percent yield if 18.3 g SF6 is isolated from the reaction of 10.0 g S8 and 30.0 g F2?

Accepted Answer

A)  40.2% 
B)  45.8% 
C)  47.6% 
D)  54.6% 
E)  61.0% 
A)  40.2% 
B)  45.8% 
C)  47.6% 
D)  54.6% 
E)  61.0%

Question 12

What is the molarity of an NaI solution that contains 5.3 g of NaI in 41.0 mL of solution?

Accepted Answer

A)  0.86 M 
B)  0.035 M 
C)  0.0077 M 
D)  0.00027 M 
E)  0.13 M 
A)  0.86 M 
B)  0.035 M 
C)  0.0077 M 
D)  0.00027 M 
E)  0.13 M

Question 13

What minimum mass of copper (II)nitrate must be added to 30.0 mL of a 0.0387 M phosphate solution in order to completely precipitate all of the phosphate as solid copper (II)phosphate?
2PO43-(aq)+ 3Cu(NO3)2(aq)$\to$ Cu3(PO4)2(s)+ 6NO3-(aq)

Accepted Answer

A)  0.218 g 
B)  0.653 g 
C)  0.145 g 
D)  0.0726 g 
E)  0.327 g 
A)  0.218 g 
B)  0.653 g 
C)  0.145 g 
D)  0.0726 g 
E)  0.327 g

Question 14

A 5.95-g sample of AgNO3 is reacted with excess BaCl2 according to the equation
2AgNO3(aq)+ BaCl2(aq)$\to$ 2AgCl(s)+ Ba(NO3)2(aq)
To give 3.75 g of AgCl.What is the percent yield of AgCl?

Accepted Answer

A)  49.8 % 
B)  37.4 % 
C)  74.7 % 
D)  63.0 % 
E)  100 % 
A)  49.8 % 
B)  37.4 % 
C)  74.7 % 
D)  63.0 % 
E)  100 %

Question 15

What is the pH of 5.3 $\times$10-3 M HCl(aq)?

Accepted Answer

A)  -1.01 
B)  2.28 
C)  3.50 
D)  1.01 
E)  5.65 
A)  -1.01 
B)  2.28 
C)  3.50 
D)  1.01 
E)  5.65

Question 16

A 3.361 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 6.295 g CO2 and 3.866 g H2O.What is the empirical formula of the hydrocarbon?

Accepted Answer

A)  CH3 
B)  CH2 
C)  C2H3 
D)  CH4 
E)  CH 
A)  CH3 
B)  CH2 
C)  C2H3 
D)  CH4 
E)  CH

Question 17

A dilute solution is prepared by transferring 45.00 mL of a 0.5616 M stock solution to a 400.0 mL volumetric flask and diluting to mark.What is the molarity of this dilute solution?

Accepted Answer

A)  0.06318 M 
B)  0.1264 M 
C)  0.04992 M 
D)  0.01580 M 
E)  0.2808 M 
A)  0.06318 M 
B)  0.1264 M 
C)  0.04992 M 
D)  0.01580 M 
E)  0.2808 M

Question 18

Sulfur trioxide,SO3,is made from the oxidation of SO2as follows: 2SO2 + O2 $\to$ 2SO3
A 21-g sample of SO2 gives 18 g of SO3.The $\underline{\text{  percent yield }}$  of SO3 is .

Accepted Answer

A)  11 % 
B)  69 % 
C)  17 % 
D)  26 % 
E)  100 % 
A)  11 % 
B)  69 % 
C)  17 % 
D)  26 % 
E)  100 %

Question 19

A 4.541 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 8.674 g CO2 and 5.328 g H2O.What is the empirical formula of the compound?

Accepted Answer

A)  CHO 
B)  C2H6O 
C)  C3H6O 
D)  C3H4O 
E)  C3H8O3 
A)  CHO 
B)  C2H6O 
C)  C3H6O 
D)  C3H4O 
E)  C3H8O3

Question 20

The following equation: A = $\varepsilon$$\times$    
$\times$  C (where    
is path length and C is concentration)is known as the _____-Lambert law.

Accepted Answer

The answer of The following equation: A = $\varepsilon$$\times$ ...

Exam 5: Stoichiometry: Quantitative Information About Chemical Reactions

A certain compound has a molar mass of 150 g/mol.Which is a possible empirical formula for this compound?

If the complete combustion of an unknown mass of ethylene produces 16.0 g CO2,what mass of ethylene is combusted? C2H4(g)+ 3 O2(g) →\to→ 2 CO2(g)+ 2 H2O(g)

Calculate the number of moles of O2 required to react with phosphorus to produce 4.76 g of P4O6. (Molar mass P4O6 = 219.9 g/mol)

PCl3 can be produced from the reaction of P4 with Cl2. P4(s)+ 6 Cl2(g) →\to→ 4 PCl3(g) If 1.00 g P4 reacts with 1.00 g Cl2,which reactant is the limiting reactant? What mass of product may be produced?

How many moles of sulfate ions are there in a 0.387-L solution of 0.927 M Al2(SO4)3?

A 1.850 g mixture of SrCO3 and SrO is heated.The SrCO3 decomposes to SrO and CO2.What was the mass percentage of SrCO3 in the mixture if the mass after heating is 1.445 g?

A 1.185 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 2.264 g CO2 and 1.390 g H2O.What mass of oxygen is contained in the original sample?

The empirical formula of ethylene is CH2.An experimental determination of the molar mass of ethylene yields the value of 28 g/mol.What is the molecular ‾\underline{\text{ molecular }} molecular ​ formula of ethylene?

A mass of 0.4113 g of an unknown acid,HA,is titrated with NaOH.If the acid reacts with 28.10 mL of 0.1055 M NaOH(aq),what is the molar mass of the acid?

If 48.8 g of O2 is mixed with 48.8 g of H2 and the mixture is ignited,what is the maximum mass of water that may be produced?

Sulfur hexafluoride is produced by reacting elemental sulfur with fluorine gas.S8(s)+ 24 F2(g) →\to→ 8 SF6(g) What is the percent yield if 18.3 g SF6 is isolated from the reaction of 10.0 g S8 and 30.0 g F2?

What is the molarity of an NaI solution that contains 5.3 g of NaI in 41.0 mL of solution?

What minimum mass of copper (II)nitrate must be added to 30.0 mL of a 0.0387 M phosphate solution in order to completely precipitate all of the phosphate as solid copper (II)phosphate? 2PO43-(aq)+ 3Cu(NO3)2(aq) →\to→ Cu3(PO4)2(s)+ 6NO3-(aq)

A 5.95-g sample of AgNO3 is reacted with excess BaCl2 according to the equation 2AgNO3(aq)+ BaCl2(aq) →\to→ 2AgCl(s)+ Ba(NO3)2(aq) To give 3.75 g of AgCl.What is the percent yield of AgCl?

What is the pH of 5.3 ×\times× 10-3 M HCl(aq)?

A 3.361 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 6.295 g CO2 and 3.866 g H2O.What is the empirical formula of the hydrocarbon?

A dilute solution is prepared by transferring 45.00 mL of a 0.5616 M stock solution to a 400.0 mL volumetric flask and diluting to mark.What is the molarity of this dilute solution?

Sulfur trioxide,SO3,is made from the oxidation of SO2as follows: 2SO2 + O2 →\to→ 2SO3 A 21-g sample of SO2 gives 18 g of SO3.The percent yield ‾\underline{\text{ percent yield }} percent yield ​ of SO3 is .

A 4.541 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 8.674 g CO2 and 5.328 g H2O.What is the empirical formula of the compound?

The following equation: A = ε\varepsilonε×\times× ×\times× C (where is path length and C is concentration)is known as the _____-Lambert law.

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Mathlets Review: The Tools of Quantitative Chemistry

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Principles of Chemical Reactivity: Energy and Chemical Reactions

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The Structure of Atoms and Periodic Trends

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Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

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Principles of Reactivity: Chemical Equilibria

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If the complete combustion of an unknown mass of ethylene produces 16.0 g CO₂,what mass of ethylene is combusted? C₂H₄(g)+ 3 O₂(g) $\to$ 2 CO₂(g)+ 2 H₂O(g)

Calculate the number of moles of O₂ required to react with phosphorus to produce 4.76 g of P₄O₆. (Molar mass P₄O₆ = 219.9 g/mol)

PCl₃ can be produced from the reaction of P₄ with Cl₂. P₄(s)+ 6 Cl₂(g) $\to$ 4 PCl₃(g) If 1.00 g P₄ reacts with 1.00 g Cl₂,which reactant is the limiting reactant? What mass of product may be produced?

How many moles of sulfate ions are there in a 0.387-L solution of 0.927 M Al₂(SO₄)₃?

A 1.850 g mixture of SrCO₃ and SrO is heated.The SrCO₃ decomposes to SrO and CO₂.What was the mass percentage of SrCO₃ in the mixture if the mass after heating is 1.445 g?

A 1.185 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 2.264 g CO₂and 1.390 g H₂O.What mass of oxygen is contained in the original sample?

The empirical formula of ethylene is CH₂.An experimental determination of the molar mass of ethylene yields the value of 28 g/mol.What is the $\underline{\text{ molecular }}$ formula of ethylene?

If 48.8 g of O₂ is mixed with 48.8 g of H₂ and the mixture is ignited,what is the maximum mass of water that may be produced?

Sulfur hexafluoride is produced by reacting elemental sulfur with fluorine gas.S₈(s)+ 24 F₂(g) $\to$ 8 SF₆(g) What is the percent yield if 18.3 g SF₆ is isolated from the reaction of 10.0 g S₈ and 30.0 g F₂?

What minimum mass of copper (II)nitrate must be added to 30.0 mL of a 0.0387 M phosphate solution in order to completely precipitate all of the phosphate as solid copper (II)phosphate? 2PO₄^3-(aq)+ 3Cu(NO₃)₂(aq) $\to$ Cu₃(PO₄)₂(s)+ 6NO₃^-(aq)

A 5.95-g sample of AgNO₃ is reacted with excess BaCl₂ according to the equation 2AgNO₃(aq)+ BaCl₂(aq) $\to$ 2AgCl(s)+ Ba(NO₃)₂(aq) To give 3.75 g of AgCl.What is the percent yield of AgCl?

What is the pH of 5.3 $\times$ 10^-3 M HCl(aq)?

A 3.361 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 6.295 g CO₂and 3.866 g H₂O.What is the empirical formula of the hydrocarbon?

Sulfur trioxide,SO₃,is made from the oxidation of SO₂as follows: 2SO₂ + O₂ $\to$ 2SO₃ A 21-g sample of SO₂ gives 18 g of SO₃.The $\underline{\text{ percent yield }}$ of SO₃ is .

A 4.541 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 8.674 g CO₂and 5.328 g H₂O.What is the empirical formula of the compound?