Question 1

The limiting reactant is the reactant

Accepted Answer

A) that has the lowest coefficient in the balanced equation. 
B) that has the lowest molar mass. 
C) that is left over after the reaction has gone to completion. 
D) for which there is the lowest mass in grams. 
E) none of the above 
A) that has the lowest coefficient in the balanced equation. 
B) that has the lowest molar mass. 
C) that is left over after the reaction has gone to completion. 
D) for which there is the lowest mass in grams. 
E) none of the above

Question 2

A compound has a molar mass of 319.9g/mol and contains 30.01 % oxygen atoms by mass.How many oxygen atoms are in each molecule of this compound?

Accepted Answer

A) 6 
B) 4 
C) 10 
D) 3 
E) 7 
A) 6 
B) 4 
C) 10 
D) 3 
E) 7

Question 3

Consider an initial mixture of CH4 and O2 represented in the container below:   Given the reaction CH4 + 2O2 → CO2 + 2H2O,which of the following represents a stoichiometric picture of the container after the reaction has gone to completion?

Accepted Answer

A)    
B)    
C)    
D)    
E) none of the above 
A)    
B)    
C)    
D)    
E) none of the above

Question 4

What is the mass of carbon in grams found in one molecule of the compound C7H8O4?

Accepted Answer

A)    g 
B)    g 
C)    g 
D)    g 
E) 156.000000 g 
A)    g 
B)    g 
C)    g 
D)    g 
E) 156.000000 g

Question 5

Which of the following contains the greatest mass of oxygen atoms?

Accepted Answer

A) 0.5 mol CoSO4 • 7H2O 
B) 2.1 mol KHSO4 
C) 1.1 mol K2Cr2O7 
D) 2.1 mol H2O2 
E) 2.1 mol Na2S2O3 
A) 0.5 mol CoSO4 • 7H2O 
B) 2.1 mol KHSO4 
C) 1.1 mol K2Cr2O7 
D) 2.1 mol H2O2 
E) 2.1 mol Na2S2O3

Question 6

A 4.215 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 9.582 g CO2 and 3.922 g H2O.What percent by mass of oxygen is contained in the original sample?

Accepted Answer

A) 27.54 % 
B) 32.75 % 
C) 12.73 % 
D) 13.42 % 
E) 6.939 % 
A) 27.54 % 
B) 32.75 % 
C) 12.73 % 
D) 13.42 % 
E) 6.939 %

Question 7

How many atoms of carbon are there in 0.37 mol of procaine,C13H20N2O2,a "pain killer" used by dentists?

Accepted Answer

A) 4.8 × 1023 
B) 3.1 × 1024 
C) 2.9 × 1024 
D) 4.5 × 1023 
E) 3.3 × 1024 
A) 4.8 × 1023 
B) 3.1 × 1024 
C) 2.9 × 1024 
D) 4.5 × 1023 
E) 3.3 × 1024

Question 8

What is the molecular mass of the hydrocarbon styrene (shown in the figure)?

Accepted Answer

A) 104.1 amu. 
B) 91.1 amu. 
C) 103.1 amu. 
D) 13.0 amu. 
E) 78.1 amu. 
A) 104.1 amu. 
B) 91.1 amu. 
C) 103.1 amu. 
D) 13.0 amu. 
E) 78.1 amu.

Question 9

What is the mass in grams of 0.754 mol of glucose,C6H12O6?

Accepted Answer

A) 0.00419 g 
B) 72.4 g 
C) 136 g 
D) 22.6 g 
E) 239 g 
A) 0.00419 g 
B) 72.4 g 
C) 136 g 
D) 22.6 g 
E) 239 g

Question 10

One commercial system removes SO2 emissions from smoke at 95.0°C by the following set of balanced reactions:
SO2(g)+ Cl2 → SO2Cl2(g)
SO2Cl2 + 2H2O → H2SO4 + 2HCl
H2SO4 + Ca(OH)2 → CaSO4(s)+ 2H2O
Assuming the process is 95.0 % efficient,how many grams of CaSO4 may be produced from 100.g of SO2? (molar masses: SO2,64.1 g/mol; CaSO4,136 g/mol)

Accepted Answer

A) 87.2 g 
B) 202 g 
C) 44.8 g 
D) 47.1 g 
E) 212 g 
A) 87.2 g 
B) 202 g 
C) 44.8 g 
D) 47.1 g 
E) 212 g

Question 11

In 0.266 mol of trimellitic acid,C6H3(COOH)3,there are

Accepted Answer

A) 1.60 × 1022 molecules. 
B) 6.41 × 1024 molecules. 
C) 4.80 × 1023 oxygen atoms. 
D) 1.44 × 1024 carbon atoms. 
E) 2.67 × 1023 hydrogen atoms. 
A) 1.60 × 1022 molecules. 
B) 6.41 × 1024 molecules. 
C) 4.80 × 1023 oxygen atoms. 
D) 1.44 × 1024 carbon atoms. 
E) 2.67 × 1023 hydrogen atoms.

Question 12

One step in the isolation of pure rhodium metal (Rh)is the precipitation of rhodium(III)hydroxide from a solution containing rhodium(III)sulfate according to the following balanced chemical equation:
Rh2(SO4)3(aq)+ 6NaOH(aq)→ 2Rh(OH)3(s)+ 3Na2SO4(aq)
What is the theoretical yield of rhodium(III)hydroxide from the reaction of 0.540 g of rhodium(III)sulfate with 0.209 g of sodium hydroxide?

Accepted Answer

A) 0.268 g 
B) 0.209 g 
C) 0.168 g 
D) 0.749 g 
E) 0.336 g 
A) 0.268 g 
B) 0.209 g 
C) 0.168 g 
D) 0.749 g 
E) 0.336 g

Question 13

Sodium cyclamate,C6H11NHSO3Na,was used at one time as an artificial sweetener.C6H11NHSO3Na has a molecular mass of 201.2 g/mol.How many moles of sodium cyclamate are contained in a 56.0-g sample?

Accepted Answer

A) 0.175 mol 
B) 0.160 mol 
C) 0.278 mol 
D) 0.255 mol 
E) %1,0f mol 
A) 0.175 mol 
B) 0.160 mol 
C) 0.278 mol 
D) 0.255 mol 
E) %1,0f mol

Question 14

In 1928,1.0 g of rhenium,Re,was isolated from 660 kg of the ore molybenite.The percent by mass of this element in the molybenite was

Accepted Answer

A) 0.66 %. 
B) 0.15 %. 
C) 3.5 × 10-4 %. 
D) 6.6 × 10-3 %. 
E) 1.5 × 10-4 %. 
A) 0.66 %. 
B) 0.15 %. 
C) 3.5 × 10-4 %. 
D) 6.6 × 10-3 %. 
E) 1.5 × 10-4 %.

Question 15

A 4.957 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 9.284 g CO2 and water.What mass of hydrogen is contained in the original sample?

Accepted Answer

A) 2.423 g 
B) 4.327 g 
C) 14.24 g 
D) 1.794 g 
E) 2.478 g 
A) 2.423 g 
B) 4.327 g 
C) 14.24 g 
D) 1.794 g 
E) 2.478 g

Question 16

The formula mass of aluminum oxalate,Al2(C2O4)3,is

Accepted Answer

A) 143 amu. 
B) 318 amu. 
C) 290 amu. 
D) 204 amu. 
E) 197 amu. 
A) 143 amu. 
B) 318 amu. 
C) 290 amu. 
D) 204 amu. 
E) 197 amu.

Question 17

A 1.74 g sample of an element contains 7.887 ×1021atoms.What is the element symbol?

Accepted Answer

A) ​Cs 
B) ​I 
C) ​In 
D) ​Sb 
E) ​Cd 
A) ​Cs 
B) ​I 
C) ​In 
D) ​Sb 
E) ​Cd

Question 18

A molecular compound contains 92.3 % carbon and 7.7 % hydrogen by mass.If 0.142 mol of the compound weighs 11.08 g,what is its molecular formula?

Accepted Answer

A) C8H8 
B) C8H10 
C) C4H8 
D) C6H6 
E) CH 
A) C8H8 
B) C8H10 
C) C4H8 
D) C6H6 
E) CH

Question 19

An organic compound that has the empirical formula CHO has a molecular mass of 174 amu.Its molecular formula is

Accepted Answer

A) C7H7O7. 
B) C4H4O4. 
C) C2H2O2. 
D) C6H6O6. 
E) C10H10O10. 
A) C7H7O7. 
B) C4H4O4. 
C) C2H2O2. 
D) C6H6O6. 
E) C10H10O10.

Question 20

Ammonia,NH3,and oxygen can be reacted together in the presence of a catalyst to form only nitrogen monoxide and water.The number of moles of oxygen consumed for every 1.00 mole of NO produced is .

Accepted Answer

A) 1.25 
B) 5 
C) 3.75 
D) 0.625 
E) 2.5 
A) 1.25 
B) 5 
C) 3.75 
D) 0.625 
E) 2.5

Exam 3: Calculations With Chemical Formulas and Equations

The limiting reactant is the reactant

A compound has a molar mass of 319.9g/mol and contains 30.01 % oxygen atoms by mass.How many oxygen atoms are in each molecule of this compound?

Consider an initial mixture of CH4 and O2 represented in the container below: Given the reaction CH4 + 2O2 → CO2 + 2H2O,which of the following represents a stoichiometric picture of the container after the reaction has gone to completion?

What is the mass of carbon in grams found in one molecule of the compound C7H8O4?

Which of the following contains the greatest mass of oxygen atoms?

A 4.215 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 9.582 g CO2 and 3.922 g H2O.What percent by mass of oxygen is contained in the original sample?

How many atoms of carbon are there in 0.37 mol of procaine,C13H20N2O2,a "pain killer" used by dentists?

What is the molecular mass of the hydrocarbon styrene (shown in the figure)?

What is the mass in grams of 0.754 mol of glucose,C6H12O6?

In 0.266 mol of trimellitic acid,C6H3(COOH)3,there are

Sodium cyclamate,C6H11NHSO3Na,was used at one time as an artificial sweetener.C6H11NHSO3Na has a molecular mass of 201.2 g/mol.How many moles of sodium cyclamate are contained in a 56.0-g sample?

In 1928,1.0 g of rhenium,Re,was isolated from 660 kg of the ore molybenite.The percent by mass of this element in the molybenite was

A 4.957 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 9.284 g CO2 and water.What mass of hydrogen is contained in the original sample?

The formula mass of aluminum oxalate,Al2(C2O4)3,is

A 1.74 g sample of an element contains 7.887 ×1021atoms.What is the element symbol?

A molecular compound contains 92.3 % carbon and 7.7 % hydrogen by mass.If 0.142 mol of the compound weighs 11.08 g,what is its molecular formula?

An organic compound that has the empirical formula CHO has a molecular mass of 174 amu.Its molecular formula is

Ammonia,NH3,and oxygen can be reacted together in the presence of a catalyst to form only nitrogen monoxide and water.The number of moles of oxygen consumed for every 1.00 mole of NO produced is .

Chemistry and Measurement

Atoms, molecules, and Ions

Chemical Reactions

The Gaseous State

Thermochemistry

Quantum Theory of the Atom

Electron Configurations and Periodicity

Ionic and Covalent Bonding

Molecular Geometry and Chemical Bonding Theory

States of Matter; Liquids and Solids

Solutions

Rates of Reaction

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Thermodynamics and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry of the Main-Group Metals

The Transition Elements and Coordination Compounds

Organic Chemistry

Polymer Materials: Synthetic and Biological

Filters

Consider an initial mixture of CH₄ and O₂ represented in the container below: Given the reaction CH₄ + 2O₂ → CO₂ + 2H₂O,which of the following represents a stoichiometric picture of the container after the reaction has gone to completion?

What is the mass of carbon in grams found in one molecule of the compound C₇H₈O₄?

A 4.215 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 9.582 g CO₂ and 3.922 g H₂O.What percent by mass of oxygen is contained in the original sample?

How many atoms of carbon are there in 0.37 mol of procaine,C₁₃H₂₀N₂O₂,a "pain killer" used by dentists?

What is the mass in grams of 0.754 mol of glucose,C₆H₁₂O₆?

In 0.266 mol of trimellitic acid,C₆H₃(COOH)₃,there are

Sodium cyclamate,C₆H₁₁NHSO₃Na,was used at one time as an artificial sweetener.C₆H₁₁NHSO₃Na has a molecular mass of 201.2 g/mol.How many moles of sodium cyclamate are contained in a 56.0-g sample?

A 4.957 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 9.284 g CO₂ and water.What mass of hydrogen is contained in the original sample?

The formula mass of aluminum oxalate,Al₂(C₂O₄)₃,is

A 1.74 g sample of an element contains 7.887 ×10²¹atoms.What is the element symbol?

Ammonia,NH₃,and oxygen can be reacted together in the presence of a catalyst to form only nitrogen monoxide and water.The number of moles of oxygen consumed for every 1.00 mole of NO produced is .