Question 1

Ammonia reacts with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride (used in the production of aluminum,in uranium processing,and in the frosting of light bulbs) . 2NH3(g) + 5F2(g) → N2F4(g) + 6HF(g) 
How many moles of NH3 are needed to react completely with 13.6 mol of F2?

Accepted Answer

A)  34.0 mol
B)  27.2 mol
C)  6.80 mol
D)  5.44 mol
E)  2.27 molF) A) and E)
G) A) and C)

Question 2

Calculate the mass in grams of 8.35 × 1022 molecules of CBr4.

Accepted Answer

A)  0.0217 g
B)  0.139 g
C)  7.21 g
D)  12.7 g
E)  46.0 gF) None of the above
G) D) and E)

Question 3

What mass of ammonia is formed when 5.36 g of nitrogen gas reacts with excess hydrogen gas?

Accepted Answer

A)  3.26 g
B)  0.629 g
C)  13.04 g
D)  17.63 g
E)  6.52 gF) C) and D)
G) A) and B)

Question 4

Hydrochloric acid can be prepared by the following reaction: 2NaCl(s) + H2SO4(aq) → 2HCl(g) + Na2SO4(s) 
What mass of HCl can be prepared from 2.00 mol H2SO4 and 150.g NaCl?

Accepted Answer

A)  2.57 g
B)  46.8 g
C)  93.6 g
D)  146 g
E)  167gF) All of the above
G) A) and B)

Question 5

Aluminum oxide,Al2O3,is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al2O3.

Accepted Answer

A)  2.377 mol
B)  2.146 mol
C)  1.105 mol
D)  0.4660 mol
E)  0.4207 molF) A) and B)
G) B) and E)

Question 6

When a chemical equation is balanced,it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers.What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2 → ___ CO2 + ___ H2O

Accepted Answer

A)  42
B)  21
C)  11
D)  10
E)  None of these answers is correct.F) B) and D)
G) A) and D)

Question 7

The ______________ is the amount of product that forms when all the limiting reactant reacts to form the desired product.

Accepted Answer

The answer of The ______________ is the amount of product...

Question 8

As a research assistant,you are asked to prepare a 3.00 liter solution of magnesium sulfate at 45.0 micromoles per liter.How many moles of magnesium sulfate are required to make this solution?

Accepted Answer

A)  0.000135 moles
B)  0.0000150 moles
C)  1.35 × 108 moles
D)  1.50 × 107 moles
E)  None of the answers is correct.F) A) and E)
G) B) and E)

Question 9

How many moles of aspirin,C9H8O4,are in a tablet that contains 325 mg of aspirin?

Accepted Answer

A)  0.00180 moles
B)  0.555 moles
C)  0.467 moles
D)  0.357 moles
E)  2.80 molesF) C) and D)
G) B) and E) A

Question 10

Ammonia reacts with oxygen to form nitrogen monoxide and water.What is the theoretical yield and the percent yield if 17.25 g of nitrogen monoxide is produced when 21.50 g of ammonia and 26.85 g of oxygen react? (Show all your work)

Accepted Answer

Theoretical yield = ...

Question 11

A certain compound of bromine and fluorine is used to make UF6,which is an important chemical in the processing and reprocessing of nuclear fuel.The compound contains 58.37 mass percent bromine.What is its empirical formula?

Accepted Answer

A)  BrF
B)  BrF2
C)  Br2F3
D)  Br3F
E)  BrF3F) All of the above
G) B) and E)

Question 12

The limiting reactant is the reactant with the smallest initial mass.

Accepted Answer

A) True 
 B)False

Question 13

What is the mass of 0.0250 mol of P2O5?

Accepted Answer

A)  35.5 g
B)  5676 g
C)  0.0250 g
D)  1.51 × 1022 g
E)  3.55 gF) C) and E)
G) B) and E)

Question 14

The empirical formula is the simplest whole number ratio of atoms representing a chemical formula of a molecule.

Accepted Answer

A) True 
 B)False

Question 15

Aluminum reacts with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis) . Al(s) + Br2(l) → Al2Br6(s) [unbalanced]
How many moles of Al are needed to form 2.43 mol of Al2Br6?

Accepted Answer

A)  7.29 mol
B)  4.86 mol
C)  2.43 mol
D)  1.62 mol
E)  1.22 molF) A) and D)
G) All of the above

Question 16

Proteins found in humans are polymers that consist of different combinations of 20 amino acids.Proline,one of the 20 amino acids,has the molecular formula,C5H9NO2.If a human protein has 25 proline monomers,how many carbon atoms from proline are present in the protein?

Accepted Answer

A)  4 C atoms
B)  25 C atoms
C)  40 C atoms
D)  100 C atoms
E)  125 C atomsF) A) and E)
G) A) and B)

Question 17

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 1020 molecules of sulfur trioxide.

Accepted Answer

A)  6.06 × 10-4 g
B)  2.91 × 10-2 g
C)  4.85 × 10-2 g
D)  20.6 g
E)  1650 gF) A) and B)
G) B) and D) C

Question 18

Aluminum sulfate,Al2(SO4) 3,is used in tanning leather,purifying water,and the manufacture of antiperspirants.Calculate its molecular or formula mass.

Accepted Answer

A)  450.06 amu
B)  342.17 amu
C)  315.15 amu
D)  278.02 amu
E)  74.98 amuF) C) and D)
G) B) and D) B

Question 19

Magnesium (used in the manufacture of light alloys) reacts with iron(III) chloride to form magnesium chloride and iron.A mixture of 41.0 g of magnesium and 175.0 g of iron(III) chloride is allowed to react.Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.

Accepted Answer

A)  Limiting reactant is Mg; 7.4 g of FeCl3 remain.
B)  Limiting reactant is Mg; 46.5 g of FeCl3 remain.
C)  Limiting reactant is FeCl3; 1.7 g of Mg remain.
D)  Limiting reactant is FeCl3; 37.8 g of Mg remain.
E)  Limiting reactant is Mg; 134.0 g of FeCl3 remain.F) C) and D)
G) A) and E)

Question 20

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V2O5 with 40.0 g of calcium based on the following chemical equation? V2O5(s) + 5Ca(l) → 2V(l) + 5CaO(s)

Accepted Answer

A)  11.2 g
B)  5.6 g
C)  22.4 g
D)  40.0 g
E)  20.3 gF) C) and D)
G) A) and C)

Exam 3: Stoichiometry Ratios of Combination

Correct Answer
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Calculate the mass in grams of 8.35 × 10²² molecules of CBr₄.

Correct Answer
verified

What mass of ammonia is formed when 5.36 g of nitrogen gas reacts with excess hydrogen gas?

Correct Answer
verified

Hydrochloric acid can be prepared by the following reaction: 2NaCl(s) + H₂SO₄(aq) → 2HCl(g) + Na₂SO₄(s) What mass of HCl can be prepared from 2.00 mol H₂SO₄ and 150.g NaCl?

Correct Answer
verified

Aluminum oxide,Al₂O₃,is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al₂O₃.

Correct Answer
verified

When a chemical equation is balanced,it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers.What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ → _ CO₂ + _ H₂O

Correct Answer
verified

The ______________ is the amount of product that forms when all the limiting reactant reacts to form the desired product.

Correct Answer
verified

As a research assistant,you are asked to prepare a 3.00 liter solution of magnesium sulfate at 45.0 micromoles per liter.How many moles of magnesium sulfate are required to make this solution?

Correct Answer
verified

How many moles of aspirin,C₉H₈O₄,are in a tablet that contains 325 mg of aspirin?

Correct Answer
verified
A

Ammonia reacts with oxygen to form nitrogen monoxide and water.What is the theoretical yield and the percent yield if 17.25 g of nitrogen monoxide is produced when 21.50 g of ammonia and 26.85 g of oxygen react? (Show all your work)

Correct Answer
verified
Theoretical yield = ...
View Answer

A certain compound of bromine and fluorine is used to make UF₆,which is an important chemical in the processing and reprocessing of nuclear fuel.The compound contains 58.37 mass percent bromine.What is its empirical formula?

Correct Answer
verified

The limiting reactant is the reactant with the smallest initial mass.

Correct Answer
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What is the mass of 0.0250 mol of P₂O₅?

Correct Answer
verified

The empirical formula is the simplest whole number ratio of atoms representing a chemical formula of a molecule.

Correct Answer
verified

Aluminum reacts with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis) . Al(s) + Br₂(l) → Al₂Br₆(s) [unbalanced] How many moles of Al are needed to form 2.43 mol of Al₂Br₆?

Correct Answer
verified

Proteins found in humans are polymers that consist of different combinations of 20 amino acids.Proline,one of the 20 amino acids,has the molecular formula,C₅H₉NO₂.If a human protein has 25 proline monomers,how many carbon atoms from proline are present in the protein?

Correct Answer
verified

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 10²⁰ molecules of sulfur trioxide.

Correct Answer
verified
C

Aluminum sulfate,Al₂(SO₄) ₃,is used in tanning leather,purifying water,and the manufacture of antiperspirants.Calculate its molecular or formula mass.

Correct Answer
verified
B

Correct Answer
verified

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V₂O₅ with 40.0 g of calcium based on the following chemical equation? V₂O₅(s) + 5Ca(l) → 2V(l) + 5CaO(s)

Correct Answer
verified

Exam 3: Stoichiometry Ratios of Combination

Ammonia reacts with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride (used in the production of aluminum,in uranium processing,and in the frosting of light bulbs) . 2NH3(g) + 5F2(g) → N2F4(g) + 6HF(g) How many moles of NH3 are needed to react completely with 13.6 mol of F2?

Correct AnswerverifiedShow Answer

Calculate the mass in grams of 8.35 × 1022 molecules of CBr4.

Correct AnswerverifiedShow Answer

What mass of ammonia is formed when 5.36 g of nitrogen gas reacts with excess hydrogen gas?

Correct AnswerverifiedShow Answer

Hydrochloric acid can be prepared by the following reaction: 2NaCl(s) + H2SO4(aq) → 2HCl(g) + Na2SO4(s) What mass of HCl can be prepared from 2.00 mol H2SO4 and 150.g NaCl?

Correct AnswerverifiedShow Answer

Aluminum oxide,Al2O3,is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al2O3.

Correct AnswerverifiedShow Answer

When a chemical equation is balanced,it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers.What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2 → ___ CO2 + ___ H2O

Correct AnswerverifiedShow Answer

The ______________ is the amount of product that forms when all the limiting reactant reacts to form the desired product.

Correct AnswerverifiedShow Answer

As a research assistant,you are asked to prepare a 3.00 liter solution of magnesium sulfate at 45.0 micromoles per liter.How many moles of magnesium sulfate are required to make this solution?

Correct AnswerverifiedShow Answer

How many moles of aspirin,C9H8O4,are in a tablet that contains 325 mg of aspirin?

Correct AnswerverifiedA

Ammonia reacts with oxygen to form nitrogen monoxide and water.What is the theoretical yield and the percent yield if 17.25 g of nitrogen monoxide is produced when 21.50 g of ammonia and 26.85 g of oxygen react? (Show all your work)

Correct AnswerverifiedTheoretical yield = ...View AnswerShow Answer

A certain compound of bromine and fluorine is used to make UF6,which is an important chemical in the processing and reprocessing of nuclear fuel.The compound contains 58.37 mass percent bromine.What is its empirical formula?

Correct AnswerverifiedShow Answer

The limiting reactant is the reactant with the smallest initial mass.

Correct AnswerverifiedShow Answer

What is the mass of 0.0250 mol of P2O5?

Correct AnswerverifiedShow Answer

The empirical formula is the simplest whole number ratio of atoms representing a chemical formula of a molecule.

Correct AnswerverifiedShow Answer

Aluminum reacts with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis) . Al(s) + Br2(l) → Al2Br6(s) [unbalanced] How many moles of Al are needed to form 2.43 mol of Al2Br6?

Correct AnswerverifiedShow Answer

Proteins found in humans are polymers that consist of different combinations of 20 amino acids.Proline,one of the 20 amino acids,has the molecular formula,C5H9NO2.If a human protein has 25 proline monomers,how many carbon atoms from proline are present in the protein?

Correct AnswerverifiedShow Answer

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 1020 molecules of sulfur trioxide.

Correct AnswerverifiedC

Aluminum sulfate,Al2(SO4) 3,is used in tanning leather,purifying water,and the manufacture of antiperspirants.Calculate its molecular or formula mass.

Correct AnswerverifiedB

Correct AnswerverifiedShow Answer

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V2O5 with 40.0 g of calcium based on the following chemical equation? V2O5(s) + 5Ca(l) → 2V(l) + 5CaO(s)

Correct AnswerverifiedShow Answer

Correct Answer
verified

Calculate the mass in grams of 8.35 × 10²² molecules of CBr₄.

Correct Answer
verified

Correct Answer
verified

Hydrochloric acid can be prepared by the following reaction: 2NaCl(s) + H₂SO₄(aq) → 2HCl(g) + Na₂SO₄(s) What mass of HCl can be prepared from 2.00 mol H₂SO₄ and 150.g NaCl?

Correct Answer
verified

Aluminum oxide,Al₂O₃,is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al₂O₃.

Correct Answer
verified

When a chemical equation is balanced,it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers.What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ → _ CO₂ + _ H₂O

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

How many moles of aspirin,C₉H₈O₄,are in a tablet that contains 325 mg of aspirin?

Correct Answer
verified
A

Correct Answer
verified
Theoretical yield = ...
View Answer

A certain compound of bromine and fluorine is used to make UF₆,which is an important chemical in the processing and reprocessing of nuclear fuel.The compound contains 58.37 mass percent bromine.What is its empirical formula?

Correct Answer
verified

Correct Answer
verified

What is the mass of 0.0250 mol of P₂O₅?

Correct Answer
verified

Correct Answer
verified

Aluminum reacts with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis) . Al(s) + Br₂(l) → Al₂Br₆(s) [unbalanced] How many moles of Al are needed to form 2.43 mol of Al₂Br₆?

Correct Answer
verified

Proteins found in humans are polymers that consist of different combinations of 20 amino acids.Proline,one of the 20 amino acids,has the molecular formula,C₅H₉NO₂.If a human protein has 25 proline monomers,how many carbon atoms from proline are present in the protein?

Correct Answer
verified

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 10²⁰ molecules of sulfur trioxide.

Correct Answer
verified
C

Aluminum sulfate,Al₂(SO₄) ₃,is used in tanning leather,purifying water,and the manufacture of antiperspirants.Calculate its molecular or formula mass.

Correct Answer
verified
B

Correct Answer
verified

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V₂O₅ with 40.0 g of calcium based on the following chemical equation? V₂O₅(s) + 5Ca(l) → 2V(l) + 5CaO(s)

Correct Answer
verified