Question 1

-Acetone has the formula C3H6O.Which ball and stick model shown above represents acetone? [gray spheres = C,black spheres = O,unshaded spheres = H]

Accepted Answer

A) model a) 
B) model b) 
C) model c) 
D) model d) 
A) model a) 
B) model b) 
C) model c) 
D) model d)

Question 2

Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon,hydrogen,and oxygen gives 0.627 g of CO2 and 1.534 g of H2O.The molecular mass of the unknown is

Accepted Answer

A) C3H6O. 
B) C6H12O2. 
C) C9H18O3. 
D) unable to be determined from this data. 
A) C3H6O. 
B) C6H12O2. 
C) C9H18O3. 
D) unable to be determined from this data.

Question 3

Which of the following has the smallest mass?

Accepted Answer

A) 6.02 × 1023 molecules of I2 
B) 70.0 g of Cl2 
C) 2.00 mol of F2 
D) 0.040 kg of Br2 
A) 6.02 × 1023 molecules of I2 
B) 70.0 g of Cl2 
C) 2.00 mol of F2 
D) 0.040 kg of Br2

Question 4

How many chloride ions are there in 3.00 mol of aluminum chloride?

Accepted Answer

A) 3.00 chloride ions 
B) 9.00 chloride ions 
C) 1.81 × 1024 chloride ions 
D) 5.42 × 1024 chloride ions 
A) 3.00 chloride ions 
B) 9.00 chloride ions 
C) 1.81 × 1024 chloride ions 
D) 5.42 × 1024 chloride ions

Question 5

The following diagrams represent the reaction of A2 (shaded spheres)with B2 (unshaded spheres).How many moles of product can be made from 1.0 mol of A2 and 1.0 mol of B2?

Accepted Answer

A) 0.67 mol product 
B) 1.0 mol product 
C) 2.0 mol product 
D) 3.0 mol product 
A) 0.67 mol product 
B) 1.0 mol product 
C) 2.0 mol product 
D) 3.0 mol product

Question 6

How many cations are there in 50.0 g of sodium phosphate?

Accepted Answer

A) 1.84 × 1023 cations 
B) 5.51 × 1023 cations 
C) 1.97 × 1024 cations 
D) 5.92 × 1024 cations 
A) 1.84 × 1023 cations 
B) 5.51 × 1023 cations 
C) 1.97 × 1024 cations 
D) 5.92 × 1024 cations

Question 7

When the reaction C4H10 + O2 → CO2 + H2O is balanced using the smallest whole number coefficients,the coefficient in front of O2 is ________.

Accepted Answer

Question 8

The empirical formula of a compound that contains 82.66% carbon and 17.34% hydrogen is ________.

Accepted Answer

The answer of The empirical formula of a compound that...

Question 9

Analysis of a 1.000-g sample of the oral hypoglycemic agent metformintm yielded 0.3720 g of carbon,0.0858 g of hydrogen,and 0.5422 g of nitrogen.Metformintm has a molar mass of 129.16 g/mol.What is the molecular formula of Metformintm?

Accepted Answer

Question 10

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? ________ C3H6O2(l)+ ________ O2(g)→ ________ CO2(g)+ ________ H2O(l)

Accepted Answer

A) 1 
B) 3 
C) 5 
D) 7 
A) 1 
B) 3 
C) 5 
D) 7

Question 11

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 20.0 g of dinitrogen monoxide decomposes?

Accepted Answer

A) 0.138 g 
B) 7.27 g 
C) 14.5 g 
D) 29.1 g 
A) 0.138 g 
B) 7.27 g 
C) 14.5 g 
D) 29.1 g

Question 12

If the percent yield for the following reaction is 60.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq),are produced? 
3 NO2(g)+ H2O(l)→ 2 HNO3(aq)+ NO(g)

Accepted Answer

A) 24.6 g 
B) 41.1 g 
C) 54.8 g 
D) 69.3 g 
A) 24.6 g 
B) 41.1 g 
C) 54.8 g 
D) 69.3 g

Question 13

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 NO2(g)→ 2 NO(g)+ O2(g)?

Accepted Answer

A) box (a)reactants and box (b)products 
B) box (a)reactants and box (d)products 
C) box (c)reactants and box (b)products 
D) box (c)reactants and box (d)products 
A) box (a)reactants and box (b)products 
B) box (a)reactants and box (d)products 
C) box (c)reactants and box (b)products 
D) box (c)reactants and box (d)products

Question 14

Which one of the following contains 52% carbon by mass?

Accepted Answer

A) C2H2 
B) CH4 
C) CH3OCH3 
D) CO2 
A) C2H2 
B) CH4 
C) CH3OCH3 
D) CO2

Question 15

How many Fe(II)ions are there in 5.00 g of FeSO4?

Accepted Answer

A) 5.46 × 10-26 iron(II)ions 
B) 1.98 × 1022 iron(II)ions 
C) 1.83 × 1025 iron(II)ions 
D) 4.58 × 1026 iron(II)ions 
A) 5.46 × 10-26 iron(II)ions 
B) 1.98 × 1022 iron(II)ions 
C) 1.83 × 1025 iron(II)ions 
D) 4.58 × 1026 iron(II)ions

Question 16

What is the mass of 9.00 × 1022 molecules of NH3?

Accepted Answer

A) 0.00878 g 
B) 0.393 g 
C) 2.55 g 
D) 114 g 
A) 0.00878 g 
B) 0.393 g 
C) 2.55 g 
D) 114 g

Question 17

The number of grams in 0.250mol of urea, (NH2)2CO,is ________.

Accepted Answer

Question 18

What is the stoichiometric coefficient for water when the following equation is balanced using the lowest whole-number coefficients? ________ C3H8O(l)+ ________ O2(g)→ ________ CO2(g)+ ________ H2O(l)

Accepted Answer

A) 3 
B) 7 
C) 6 
D) 8 
A) 3 
B) 7 
C) 6 
D) 8

Question 19

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 N2O(g)→ 2 N2(g)+ O2(g)?

Accepted Answer

A) box (a)reactants and box (c)products 
B) box (a)reactants and box (d)products 
C) box (b)reactants and box (c)products 
D) box (b)reactants and box (d)products 
A) box (a)reactants and box (c)products 
B) box (a)reactants and box (d)products 
C) box (b)reactants and box (c)products 
D) box (b)reactants and box (d)products

Question 20

Reaction of A (unshaded spheres)with B2 (shaded spheres)is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction?

Accepted Answer

A) A2 + 2 B → A2B2 
B) 8 A + 4 B2 → 4 A2B2 
C) 2 A + B2 → A2B2 
D) 4 A + 4 B2 → 4 A2B2 
A) A2 + 2 B → A2B2 
B) 8 A + 4 B2 → 4 A2B2 
C) 2 A + B2 → A2B2 
D) 4 A + 4 B2 → 4 A2B2

Exam 3: Mass Relationships in Chemical Reactions

-Acetone has the formula C3H6O.Which ball and stick model shown above represents acetone? [gray spheres = C,black spheres = O,unshaded spheres = H]

Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon,hydrogen,and oxygen gives 0.627 g of CO2 and 1.534 g of H2O.The molecular mass of the unknown is

Which of the following has the smallest mass?

How many chloride ions are there in 3.00 mol of aluminum chloride?

The following diagrams represent the reaction of A2 (shaded spheres)with B2 (unshaded spheres).How many moles of product can be made from 1.0 mol of A2 and 1.0 mol of B2?

How many cations are there in 50.0 g of sodium phosphate?

When the reaction C4H10 + O2 → CO2 + H2O is balanced using the smallest whole number coefficients,the coefficient in front of O2 is ________.

The empirical formula of a compound that contains 82.66% carbon and 17.34% hydrogen is ________.

Analysis of a 1.000-g sample of the oral hypoglycemic agent metformintm yielded 0.3720 g of carbon,0.0858 g of hydrogen,and 0.5422 g of nitrogen.Metformintm has a molar mass of 129.16 g/mol.What is the molecular formula of Metformintm?

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? ________ C3H6O2(l)+ ________ O2(g)→ ________ CO2(g)+ ________ H2O(l)

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 20.0 g of dinitrogen monoxide decomposes?

If the percent yield for the following reaction is 60.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq),are produced? 3 NO2(g)+ H2O(l)→ 2 HNO3(aq)+ NO(g)

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 NO2(g)→ 2 NO(g)+ O2(g)?

Which one of the following contains 52% carbon by mass?

How many Fe(II)ions are there in 5.00 g of FeSO4?

What is the mass of 9.00 × 1022 molecules of NH3?

The number of grams in 0.250mol of urea, (NH2)2CO,is ________.

What is the stoichiometric coefficient for water when the following equation is balanced using the lowest whole-number coefficients? ________ C3H8O(l)+ ________ O2(g)→ ________ CO2(g)+ ________ H2O(l)

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 N2O(g)→ 2 N2(g)+ O2(g)?

Reaction of A (unshaded spheres)with B2 (shaded spheres)is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction?

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

The Main-Group Elements

Connections to Organic and Biological Chemistry

Filters

-Acetone has the formula C₃H₆O.Which ball and stick model shown above represents acetone? [gray spheres = C,black spheres = O,unshaded spheres = H]

Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon,hydrogen,and oxygen gives 0.627 g of CO₂ and 1.534 g of H₂O.The molecular mass of the unknown is

The following diagrams represent the reaction of A₂ (shaded spheres)with B₂ (unshaded spheres).How many moles of product can be made from 1.0 mol of A₂ and 1.0 mol of B₂?

When the reaction C₄H₁₀ + O₂ → CO₂+ H₂O is balanced using the smallest whole number coefficients,the coefficient in front of O₂ is ________.

Analysis of a 1.000-g sample of the oral hypoglycemic agent metformin^tm yielded 0.3720 g of carbon,0.0858 g of hydrogen,and 0.5422 g of nitrogen.Metformin^tm has a molar mass of 129.16 g/mol.What is the molecular formula of Metformin^tm^?

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? C₃H₆O₂(l)+ O₂(g)→ CO₂(g)+ H₂O(l)

If the percent yield for the following reaction is 60.0%,and 45.0 g of NO₂ are consumed in the reaction,how many grams of nitric acid,HNO₃(aq),are produced? 3 NO₂(g)+ H₂O(l)→ 2 HNO₃(aq)+ NO(g)

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 NO₂(g)→ 2 NO(g)+ O₂(g)?

How many Fe(II)ions are there in 5.00 g of FeSO₄?

What is the mass of 9.00 × 10²² molecules of NH₃?

The number of grams in 0.250mol of urea, (NH₂)₂CO,is ________.

What is the stoichiometric coefficient for water when the following equation is balanced using the lowest whole-number coefficients? C₃H₈O(l)+ O₂(g)→ CO₂(g)+ H₂O(l)

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 N₂O(g)→ 2 N₂(g)+ O₂(g)?

Reaction of A (unshaded spheres)with B₂ (shaded spheres)is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction?