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) 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%

The pH of a vinegar solution is 4.15.What is the H3O+ concentration of the solution?

A) 7.1 × 10-5 M B) 1.6 × 10-2 M C) 0.62 M D) 1.4 M E) 1.4 × 104 M A) 7.1 × 10-5 M B) 1.6 × 10-2 M C) 0.62 M D) 1.4 M E) 1.4 × 104 M

The combustion of 0.0272 mole of a hydrocarbon produces 1.9609 g H2O and 3.5927 g CO2.What is the molar mass of the hydrocarbon?

A) 16.0 g/mol B) 30.1 g/mol C) 44.1 g/mol D) 72.2 g/mol E) 92.1 g/mol A) 16.0 g/mol B) 30.1 g/mol C) 44.1 g/mol D) 72.2 g/mol E) 92.1 g/mol

The reaction of HCl with NaOH is represented by the equation HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H2O(l) What volume of 0.614 M HCl is required to titrate 18.8 mL of 0.619 M NaOH?

A) 7.15 mL B) 1.63 mL C) 19.0 mL D) 18.8 mL E) 18.6 mL A) 7.15 mL B) 1.63 mL C) 19.0 mL D) 18.8 mL E) 18.6 mL

Complete combustion of a 0.70-mol sample of a hydrocarbon,CxHy,gives 2.80 mol of CO2 and 3.50 mol of H2O.The molecular formula of the original hydrocarbon is

A) C2H8. B) C4H10. C) C8H14. D) C5H5. E) C4H6. A) C2H8. B) C4H10. C) C8H14. D) C5H5. E) C4H6.

If 56.0 g of O2 is mixed with 56.0 g of H2 and the mixture is ignited,what is the maximum mass of water that may be produced?

A) 504 g B) 63.0 g C) 56.0 g D) 112 g E) 99.6 g A) 504 g B) 63.0 g C) 56.0 g D) 112 g E) 99.6 g

The reaction of 11.9 g of CHCl3 with excess chlorine produced 10.3 g of CCl4,carbon tetrachloride: 2CHCl3 + 2Cl2 → 2CCl4 + 2HCl What is the percent yield?

A) 86.6 % B) 100 % C) 67.2 % D) 33.6 % E) 44.8 % A) 86.6 % B) 100 % C) 67.2 % D) 33.6 % E) 44.8 %

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)→ 2 CO2(g)+ 2 H2O(g)

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

Exam 5: Stoichiometry: Quantitative Information About Chemical Reactions

The empirical formula of styrene is CH.An experimental determination of the molar mass of styrene yields the value of 104 g/mol.What is the molecular formula of styrene?

(Multiple Choice)

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Question 41

How many moles of sulfate ions are there in a 0.650-L solution of 0.312 M Al₂(SO₄)₃?

(Multiple Choice)

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Question 42

Phosphorus trichloride,PCl₃,can be produced from the reaction below: P₄(s)+ 6 Cl₂(g)→ 4 PCl₃(g) If 1.00 g of phosphorus,P₄,reacts with 1.00 g of chlorine,Cl₂,which reactant is the limiting reactant and what mass of product may be produced?

(Essay)

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Question 43

If 0.1800 g of impure soda ash (Na₂CO₃)is titrated with 15.66 mL of 0.1082 M HCl,what is the percent purity of the soda ash? Na₂CO₃(aq)+ 2 HCl(aq)→ 2 NaCl(aq)+ H₂O( )+ CO₂(g)

(Multiple Choice)

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Question 44

A 1.078 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 2.451 g CO₂ and 1.003 g H₂O.What mass of oxygen is contained in the original sample?

(Multiple Choice)

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Question 45

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

(Short Answer)

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Question 46

When strongly heated,boric acid breaks down to boric oxide and water.What mass of boric oxide is formed from the decomposition of 15.0 g of boric acid,B(OH)₃? 2 B(OH)₃(s)→ B₂O₃(s)+ 3 H₂O(g)

(Multiple Choice)

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Question 47

The pH of purified water (or of a neutral solution)is _____.

(Short Answer)

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Question 48

Naphthalene,a hydrocarbon,has an approximate molar mass of 128 g/mole.If the combustion of 0.6400 g of naphthalene produces 0.3599 g of H₂O and 2.1977 g of CO₂,what is the molecular formula of this compound?

(Multiple Choice)

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Question 49

What minimum mass of cobalt (II)nitrate must be added to 60.0 mL of a 0.0999 M phosphate solution in order to completely precipitate all of the phosphate as solid cobalt (II)phosphate? 2PO₄^3-(aq)+ 3Co(NO₃)₂(aq)→ Co₃(PO₄)₂(s)+ 6NO₃^-(aq)

(Multiple Choice)

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Question 50

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?

(Multiple Choice)

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Question 51

The pH of a vinegar solution is 4.15.What is the H₃O⁺ concentration of the solution?

(Multiple Choice)

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Question 52

A certain compound has a molar mass of 210 g/mol.Which of the following is a possible empirical formula for this compound?

(Multiple Choice)

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Question 53

The combustion of 0.0272 mole of a hydrocarbon produces 1.9609 g H₂O and 3.5927 g CO₂.What is the molar mass of the hydrocarbon?

(Multiple Choice)

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Question 54

The reaction of HCl with NaOH is represented by the equation HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H₂O(l) What volume of 0.614 M HCl is required to titrate 18.8 mL of 0.619 M NaOH?

(Multiple Choice)

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Question 55

Complete combustion of a 0.70-mol sample of a hydrocarbon,C_xH_y,gives 2.80 mol of CO₂ and 3.50 mol of H₂O.The molecular formula of the original hydrocarbon is

(Multiple Choice)

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Question 56

If 56.0 g of O₂ is mixed with 56.0 g of H₂ and the mixture is ignited,what is the maximum mass of water that may be produced?

(Multiple Choice)

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Question 57

The reaction of 11.9 g of CHCl₃ with excess chlorine produced 10.3 g of CCl₄,carbon tetrachloride: 2CHCl₃ + 2Cl₂ → 2CCl₄ + 2HCl What is the percent yield?

(Multiple Choice)

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Question 58

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)→ 2 CO₂(g)+ 2 H₂O(g)

(Multiple Choice)

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Question 59

A 30.00-mL sample of a weak monoprotic acid is titrated with 0.0915 M NaOH.At the endpoint,it is found that 45.98 mL of titrant was used.What was the concentration of the weak acid?

(Multiple Choice)

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Question 60

Showing 41 - 60 of 77

Exam 5: Stoichiometry: Quantitative Information About Chemical Reactions

The empirical formula of styrene is CH.An experimental determination of the molar mass of styrene yields the value of 104 g/mol.What is the molecular formula of styrene?

How many moles of sulfate ions are there in a 0.650-L solution of 0.312 M Al2(SO4)3?

Phosphorus trichloride,PCl3,can be produced from the reaction below: P4(s)+ 6 Cl2(g)→ 4 PCl3(g) If 1.00 g of phosphorus,P4,reacts with 1.00 g of chlorine,Cl2,which reactant is the limiting reactant and what mass of product may be produced?

If 0.1800 g of impure soda ash (Na2CO3)is titrated with 15.66 mL of 0.1082 M HCl,what is the percent purity of the soda ash? Na2CO3(aq)+ 2 HCl(aq)→ 2 NaCl(aq)+ H2O( )+ CO2(g)

A 1.078 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 2.451 g CO2 and 1.003 g H2O.What mass of oxygen is contained in the original sample?

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

When strongly heated,boric acid breaks down to boric oxide and water.What mass of boric oxide is formed from the decomposition of 15.0 g of boric acid,B(OH)3? 2 B(OH)3(s)→ B2O3(s)+ 3 H2O(g)

The pH of purified water (or of a neutral solution)is _____.

Naphthalene,a hydrocarbon,has an approximate molar mass of 128 g/mole.If the combustion of 0.6400 g of naphthalene produces 0.3599 g of H2O and 2.1977 g of CO2,what is the molecular formula of this compound?

What minimum mass of cobalt (II)nitrate must be added to 60.0 mL of a 0.0999 M phosphate solution in order to completely precipitate all of the phosphate as solid cobalt (II)phosphate? 2PO43-(aq)+ 3Co(NO3)2(aq)→ Co3(PO4)2(s)+ 6NO3-(aq)

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?

The pH of a vinegar solution is 4.15.What is the H3O+ concentration of the solution?

A certain compound has a molar mass of 210 g/mol.Which of the following is a possible empirical formula for this compound?

The combustion of 0.0272 mole of a hydrocarbon produces 1.9609 g H2O and 3.5927 g CO2.What is the molar mass of the hydrocarbon?

The reaction of HCl with NaOH is represented by the equation HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H2O(l) What volume of 0.614 M HCl is required to titrate 18.8 mL of 0.619 M NaOH?

Complete combustion of a 0.70-mol sample of a hydrocarbon,CxHy,gives 2.80 mol of CO2 and 3.50 mol of H2O.The molecular formula of the original hydrocarbon is

If 56.0 g of O2 is mixed with 56.0 g of H2 and the mixture is ignited,what is the maximum mass of water that may be produced?

The reaction of 11.9 g of CHCl3 with excess chlorine produced 10.3 g of CCl4,carbon tetrachloride: 2CHCl3 + 2Cl2 → 2CCl4 + 2HCl What is the percent yield?

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)→ 2 CO2(g)+ 2 H2O(g)

A 30.00-mL sample of a weak monoprotic acid is titrated with 0.0915 M NaOH.At the endpoint,it is found that 45.98 mL of titrant was used.What was the concentration of the weak acid?

Basic Concepts of Chemistry

Lets Review: The Tools of Quantitative Chemistry

Atoms, molecules, and Ions

Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Bonding and Molecular Structure Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

The Solid State

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Chemical Reactivity: Equilibria

Principles of Chemical Reactivity: the Chemistry of Acids and Bases

Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria

Principles of Chemical Reactivity: Entropy and Free Energy

Principles of Chemical Reactivity: Electron Transfer Reactions

Environmental Chemistry: Earths Environment, energy, and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters

How many moles of sulfate ions are there in a 0.650-L solution of 0.312 M Al₂(SO₄)₃?

Phosphorus trichloride,PCl₃,can be produced from the reaction below: P₄(s)+ 6 Cl₂(g)→ 4 PCl₃(g) If 1.00 g of phosphorus,P₄,reacts with 1.00 g of chlorine,Cl₂,which reactant is the limiting reactant and what mass of product may be produced?

If 0.1800 g of impure soda ash (Na₂CO₃)is titrated with 15.66 mL of 0.1082 M HCl,what is the percent purity of the soda ash? Na₂CO₃(aq)+ 2 HCl(aq)→ 2 NaCl(aq)+ H₂O( )+ CO₂(g)

A 1.078 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 2.451 g CO₂ and 1.003 g H₂O.What mass of oxygen is contained in the original sample?

When strongly heated,boric acid breaks down to boric oxide and water.What mass of boric oxide is formed from the decomposition of 15.0 g of boric acid,B(OH)₃? 2 B(OH)₃(s)→ B₂O₃(s)+ 3 H₂O(g)

Naphthalene,a hydrocarbon,has an approximate molar mass of 128 g/mole.If the combustion of 0.6400 g of naphthalene produces 0.3599 g of H₂O and 2.1977 g of CO₂,what is the molecular formula of this compound?

What minimum mass of cobalt (II)nitrate must be added to 60.0 mL of a 0.0999 M phosphate solution in order to completely precipitate all of the phosphate as solid cobalt (II)phosphate? 2PO₄^3-(aq)+ 3Co(NO₃)₂(aq)→ Co₃(PO₄)₂(s)+ 6NO₃^-(aq)

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?

The pH of a vinegar solution is 4.15.What is the H₃O⁺ concentration of the solution?

The combustion of 0.0272 mole of a hydrocarbon produces 1.9609 g H₂O and 3.5927 g CO₂.What is the molar mass of the hydrocarbon?

The reaction of HCl with NaOH is represented by the equation HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H₂O(l) What volume of 0.614 M HCl is required to titrate 18.8 mL of 0.619 M NaOH?

Complete combustion of a 0.70-mol sample of a hydrocarbon,C_xH_y,gives 2.80 mol of CO₂ and 3.50 mol of H₂O.The molecular formula of the original hydrocarbon is

If 56.0 g of O₂ is mixed with 56.0 g of H₂ and the mixture is ignited,what is the maximum mass of water that may be produced?

The reaction of 11.9 g of CHCl₃ with excess chlorine produced 10.3 g of CCl₄,carbon tetrachloride: 2CHCl₃ + 2Cl₂ → 2CCl₄ + 2HCl What is the percent yield?

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)→ 2 CO₂(g)+ 2 H₂O(g)