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

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

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?

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

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

A) 0.0217 g B) 0.139 g C) 7.21 g D) 12.7 g E) 46.0 g A) 0.0217 g B) 0.139 g C) 7.21 g D) 12.7 g E) 46.0 g

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?

A) 2.57 g B) 46.8 g C) 93.6 g D) 146 g E) 167g A) 2.57 g B) 46.8 g C) 93.6 g D) 146 g E) 167g

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)

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

What is the mass of 0.0250 mol of P2O5?

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

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?

A) 7.29 mol B) 4.86 mol C) 2.43 mol D) 1.62 mol E) 1.22 mol A) 7.29 mol B) 4.86 mol C) 2.43 mol D) 1.62 mol E) 1.22 mol

Exam 3: Stoichiometry Ratios of Combination

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.

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(Multiple Choice)

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Question 1

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

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(Multiple Choice)

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Question 2

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

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Question 3

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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?

(Multiple Choice)

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Question 4

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?

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Question 5

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

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Question 6

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

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Question 7

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)

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Question 8

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

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Question 9

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

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Question 10

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

(True/False)

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Question 11

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.

(Multiple Choice)

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Question 12

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?

(Multiple Choice)

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Question 13

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?

(Multiple Choice)

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Question 14

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

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Question 15

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?

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Question 16

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.

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Question 17

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)

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Question 18

What is the mass of 0.0250 mol of P₂O₅?

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Question 19

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?

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Question 20

Showing 1 - 20 of 131

Exam 3: Stoichiometry Ratios of Combination

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.

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

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

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?

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?

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

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

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)

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

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

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

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?

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?

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

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?

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.

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)

What is the mass of 0.0250 mol of P2O5?

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?

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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.

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

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

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?

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

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?

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

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?

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.

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)

What is the mass of 0.0250 mol of P₂O₅?

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?