Question 1

If 4.0 g of H2 react with 4.0 g of F2 in the reaction shown below,what is the limiting reactant?
H2 + F2 → 2 HF

Accepted Answer

Question 2

How many anions are in 0.500 g of MgBr2?

Accepted Answer

A) 1)64 × 1021 anions 
B) 3)27 × 1021 anions 
C) 2)22 × 1026 anions 
D) 4)43 × 1026 anions 
A) 1)64 × 1021 anions 
B) 3)27 × 1021 anions 
C) 2)22 × 1026 anions 
D) 4)43 × 1026 anions

Question 3

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 10.0 g of Fe2O3.
_____ MgO(s)+ _____ Fe(s)→ _____ Fe2O3(s)+ _____ Mg(s)

Accepted Answer

A) 0)312 g 
B) 0)841 g 
C) 2)52 g 
D) 7)57 g 
A) 0)312 g 
B) 0)841 g 
C) 2)52 g 
D) 7)57 g

Question 4

Molecular mass can be determined by

Accepted Answer

A) combustion analysis. 
B) mass spectrometry. 
C) titration. 
D) weighing with an analytical balance. 
A) combustion analysis. 
B) mass spectrometry. 
C) titration. 
D) weighing with an analytical balance.

Question 5

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients?
_____ C2H6O (l)+ _____ O2(g)→ _____ CO2(g)+ _____ H2O(l)

Accepted Answer

A) 9 
B) 7 
C) 5 
D) 3 
A) 9 
B) 7 
C) 5 
D) 3

Question 6

Which statement about elemental analysis by combustion is not correct?

Accepted Answer

A) Carbon is determined from the amount of CO2 formed. 
B) Hydrogen is determined from the amount of H2O formed. 
C) Oxygen is determined from the amount of H2O formed. 
D) Only carbon and hydrogen can be determined directly from CO2 and H2O. 
A) Carbon is determined from the amount of CO2 formed. 
B) Hydrogen is determined from the amount of H2O formed. 
C) Oxygen is determined from the amount of H2O formed. 
D) Only carbon and hydrogen can be determined directly from CO2 and H2O.

Question 7

What is the concentration of an AlCl3 solution if 150.mL of the solution contains 450.mg of
Cl- ion?

Accepted Answer

A) 2)82 × 10-2 M 
B) 6)75 × 10-2 M 
C) 8)46 × 10- 2 M 
D) 2)54 × 10-1 M 
A) 2)82 × 10-2 M 
B) 6)75 × 10-2 M 
C) 8)46 × 10- 2 M 
D) 2)54 × 10-1 M

Question 8

When 7.00 × 1022 molecules of ammonia react with 6.00 × 1022 molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced?
4 NH3(g)+ 3 O2(g)→ 2 N2(g)+ 6 H2O(g)

Accepted Answer

A) 1)63 g 
B) 1)86 g 
C) 4)19 g 
D) 6)51 g 
A) 1)63 g 
B) 1)86 g 
C) 4)19 g 
D) 6)51 g

Question 9

Which contains Avogadro's number of formula units?

Accepted Answer

A) 36.5 g of Cl 
B) 36.5 g of Cl2 
C) 36.5 g of HCl 
D) All of these 
A) 36.5 g of Cl 
B) 36.5 g of Cl2 
C) 36.5 g of HCl 
D) All of these

Question 10

The following diagrams represent the reaction of A2 (shaded spheres)with B2 (unshaded spheres).Identify the limiting reactant and write a balanced equation for the reaction.

Accepted Answer

A) A2 is the limiting reactant;A + 4 B → AB4. 
B) A2 is the limiting reactant;A2 + 4 B2 → 2 AB4. 
C) B2 is the limiting reactant;A + 4 B → AB4. 
D) B2 is the limiting reactant;A2 + 4 B2 → 2 AB4. 
A) A2 is the limiting reactant;A + 4 B → AB4. 
B) A2 is the limiting reactant;A2 + 4 B2 → 2 AB4. 
C) B2 is the limiting reactant;A + 4 B → AB4. 
D) B2 is the limiting reactant;A2 + 4 B2 → 2 AB4.

Question 11

-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 12

Combustion analysis of 2.400 g of an unknown compound containing carbon,hydrogen,and oxygen produced 4.171 g of CO2 and 2.268 g of H2O.What is the empirical formula of the compound?

Accepted Answer

A) C2H5O 
B) C2H5O2 
C) C2H10O3 
D) C3H8O2 
A) C2H5O 
B) C2H5O2 
C) C2H10O3 
D) C3H8O2

Question 13

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below.
Which one of the following statements is false?
3 Fe(s)+ 4 H2O(l)→ Fe3O4(s)+ 4 H2(g)

Accepted Answer

A) 6)91 g of Fe3O4 are produced. 
B) 2)85 g of H2O are left over. 
C) Mass is conserved in this reaction. 
D) Water is the limiting reactant. 
A) 6)91 g of Fe3O4 are produced. 
B) 2)85 g of H2O are left over. 
C) Mass is conserved in this reaction. 
D) Water is the limiting reactant.

Question 14

What is the concentration of FeCl3 in a solution prepared by dissolving 20.0 g of FeCl3 in enough water to make 275 mL of solution?

Accepted Answer

A) 4)48 × 10-4 M 
B) 0)448 M 
C) 2)23 M 
D) 2)23 × 103 M 
A) 4)48 × 10-4 M 
B) 0)448 M 
C) 2)23 M 
D) 2)23 × 103 M

Question 15

How many moles of BCl3 are needed to produce 10.0 g of HCl(aq)in the following reaction?
BCl3(g)+ 3 H2O(l)→ 3 HCl(aq)+ B(OH)3(aq)

Accepted Answer

A) 0)0914 mol 
B) 0)274 mol 
C) 0)823 mol 
D) 10.9 mol 
A) 0)0914 mol 
B) 0)274 mol 
C) 0)823 mol 
D) 10.9 mol

Question 16

How many grams of calcium chloride are needed to produce 10.0 g of potassium chloride?
CaCl2(aq)+ K2CO3(aq)→ 2 KCl(aq)+ CaCO3(aq)

Accepted Answer

A) 0)134 g 
B) 7)44 g 
C) 14.9 g 
D) 29.8 g 
A) 0)134 g 
B) 7)44 g 
C) 14.9 g 
D) 29.8 g

Question 17

What is the molar mass of butane if 5.19 × 1016 molecules of butane weigh 5.00 μg?

Accepted Answer

A) 58.0 g/mol 
B) 172 g/mol 
C) 232 g/mol 
D) 431 g/mol 
A) 58.0 g/mol 
B) 172 g/mol 
C) 232 g/mol 
D) 431 g/mol

Question 18

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below.Which one of the following statements is false?
3 Fe(s)+ 4 H2O(l)→ Fe3O4(s)+ 4 H2(g)

Accepted Answer

A) 6)91 g of Fe3O4 are produced. 
B) 2)85 g of H2O are left over. 
C) Mass is conserved in this reaction. 
D) Water is the limiting reactant. 
A) 6)91 g of Fe3O4 are produced. 
B) 2)85 g of H2O are left over. 
C) Mass is conserved in this reaction. 
D) Water is the limiting reactant.

Question 19

What is the balanced chemical equation for the reaction of element A (unshaded spheres)with element B (shaded spheres)as represented below?

Accepted Answer

A) A + B → AB 
B) 2A + 3B → 2AB 
C) A + B2 → AB3 
D) 2A + 3B2 → 2AB3 
A) A + B → AB 
B) 2A + 3B → 2AB 
C) A + B2 → AB3 
D) 2A + 3B2 → 2AB3

Question 20

What is the molar mass of hydrogen gas?

Accepted Answer

A) 1)00 g/mol 
B) 2)00 g/mol 
C) 6)02 × 1023 g/mol 
D) 1)20 × 1023 g/mol 
A) 1)00 g/mol 
B) 2)00 g/mol 
C) 6)02 × 1023 g/mol 
D) 1)20 × 1023 g/mol

Exam 3: Formulas, equations, and Moles

If 4.0 g of H2 react with 4.0 g of F2 in the reaction shown below,what is the limiting reactant? H2 + F2 → 2 HF

How many anions are in 0.500 g of MgBr2?

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 10.0 g of Fe2O3. _____ MgO(s)+ _____ Fe(s)→ _____ Fe2O3(s)+ _____ Mg(s)

Molecular mass can be determined by

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? _____ C2H6O (l)+ _____ O2(g)→ _____ CO2(g)+ _____ H2O(l)

Which statement about elemental analysis by combustion is not correct?

What is the concentration of an AlCl3 solution if 150.mL of the solution contains 450.mg of Cl- ion?

When 7.00 × 1022 molecules of ammonia react with 6.00 × 1022 molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced? 4 NH3(g)+ 3 O2(g)→ 2 N2(g)+ 6 H2O(g)

Which contains Avogadro's number of formula units?

The following diagrams represent the reaction of A2 (shaded spheres)with B2 (unshaded spheres).Identify the limiting reactant and write a balanced equation for the reaction.

-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 2.400 g of an unknown compound containing carbon,hydrogen,and oxygen produced 4.171 g of CO2 and 2.268 g of H2O.What is the empirical formula of the compound?

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below. Which one of the following statements is false? 3 Fe(s)+ 4 H2O(l)→ Fe3O4(s)+ 4 H2(g)

What is the concentration of FeCl3 in a solution prepared by dissolving 20.0 g of FeCl3 in enough water to make 275 mL of solution?

How many moles of BCl3 are needed to produce 10.0 g of HCl(aq)in the following reaction? BCl3(g)+ 3 H2O(l)→ 3 HCl(aq)+ B(OH)3(aq)

How many grams of calcium chloride are needed to produce 10.0 g of potassium chloride? CaCl2(aq)+ K2CO3(aq)→ 2 KCl(aq)+ CaCO3(aq)

What is the molar mass of butane if 5.19 × 1016 molecules of butane weigh 5.00 μg?

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below.Which one of the following statements is false? 3 Fe(s)+ 4 H2O(l)→ Fe3O4(s)+ 4 H2(g)

What is the balanced chemical equation for the reaction of element A (unshaded spheres)with element B (shaded spheres)as represented below?

What is the molar mass of hydrogen gas?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds 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

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

If 4.0 g of H₂ react with 4.0 g of F₂ in the reaction shown below,what is the limiting reactant? H₂ + F₂ → 2 HF

How many anions are in 0.500 g of MgBr₂?

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 10.0 g of Fe₂O₃. ___ MgO(s)+ _ Fe(s)→ _ Fe₂O₃(s)+ ___ Mg(s)

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? ___ C₂H₆O(l)+ _ O₂(g)→ _ CO₂(g)+ ___ H₂O(l)

What is the concentration of an AlCl₃ solution if 150.mL of the solution contains 450.mg of Cl^- ion?

When 7.00 × 10²² molecules of ammonia react with 6.00 × 10²² molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced? 4 NH₃(g)+ 3 O₂(g)→ 2 N₂(g)+ 6 H₂O(g)

The following diagrams represent the reaction of A₂ (shaded spheres)with B₂ (unshaded spheres).Identify the limiting reactant and write a balanced equation for the reaction.

-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 2.400 g of an unknown compound containing carbon,hydrogen,and oxygen produced 4.171 g of CO₂ and 2.268 g of H₂O.What is the empirical formula of the compound?

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below. Which one of the following statements is false? 3 Fe(s)+ 4 H₂O(l)→ Fe₃O₄(s)+ 4 H₂(g)

What is the concentration of FeCl₃ in a solution prepared by dissolving 20.0 g of FeCl₃ in enough water to make 275 mL of solution?

How many moles of BCl₃ are needed to produce 10.0 g of HCl(aq)in the following reaction? BCl₃(g)+ 3 H₂O(l)→ 3 HCl(aq)+ B(OH)₃(aq)

How many grams of calcium chloride are needed to produce 10.0 g of potassium chloride? CaCl₂(aq)+ K₂CO₃(aq)→ 2 KCl(aq)+ CaCO₃(aq)

What is the molar mass of butane if 5.19 × 10¹⁶ molecules of butane weigh 5.00 μg?

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below.Which one of the following statements is false? 3 Fe(s)+ 4 H₂O(l)→ Fe₃O₄(s)+ 4 H₂(g)