Question 1

How many sulfur dioxide molecules are there in 0.180 mol of sulfur dioxide?

Accepted Answer

A)  1.08 × 1024 
B)  6.02 × 1024 
C)  6.02 × 1023 
D)  1.80 × 1023 
E)  1.08 × 1023 
A)  1.08 × 1024 
B)  6.02 × 1024 
C)  6.02 × 1023 
D)  1.80 × 1023 
E)  1.08 × 1023

Question 2

The combustion of propane (C3H8 ) in the presence of excess oxygen yields CO2 and H2O:
 C3H8 (g) + 5O2 (g) - 3CO2 (g) + 4H2O (g)
When 7.3 g of C3H8 burns in the presence of excess O2, _ g of CO2 is produced.

Accepted Answer

Question 3

When the following equation is balanced, the coefficient of H2SO4 is _ .

Accepted Answer

A)  2 
B)  3 
C)  0.5 
D)  1 
E)  4 
A)  2 
B)  3 
C)  0.5 
D)  1 
E)  4

Question 4

Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide:
 
How many grams of lead (II) oxide will be produced by the decomposition of 2.50 g of lead (II) carbonate?

Accepted Answer

A)  0.00936 
B)  0.41 
C)  2.61 
D)  2.09 
E)  2.50 
A)  0.00936 
B)  0.41 
C)  2.61 
D)  2.09 
E)  2.50

Question 5

How many moles of pyridine (C5H5N) are contained in 3.13 g of pyridine?

Accepted Answer

A)  0.00404 
B)  0.0396 
C)  25.3 
D)  4.04 × 103  
E)  0.319 
A)  0.00404 
B)  0.0396 
C)  25.3 
D)  4.04 × 103  
E)  0.319

Question 6

The mass % of F in the binary compound KrF2 is _ .

Accepted Answer

A)  45.38 
B)  68.80 
C)  18.48 
D)  81.52 
E)  31.20 
A)  45.38 
B)  68.80 
C)  18.48 
D)  81.52 
E)  31.20

Question 7

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 50.00 gram sample of the alcohol produced 95.50 grams of CO2 and 58.70 grams of H2O. What is the empirical formula of the alcohol?

Accepted Answer

Question 8

Predict the product in the combination reaction below.

Accepted Answer

A)  Al3N2  
B)  AlN2  
C)  Al3N 
D)  AlN3  
E)  AlN 
A)  Al3N2  
B)  AlN2  
C)  Al3N 
D)  AlN3  
E)  AlN

Question 9

Which hydrocarbon pair below have identical mass percentage of C?

Accepted Answer

A)  C2H4 and C4H2 
B)  C2H4 and C3H4 
C)  C3H4 and C3H6 
D)  C2H4 and C3H6 
E)  none of the above 
A)  C2H4 and C4H2 
B)  C2H4 and C3H4 
C)  C3H4 and C3H6 
D)  C2H4 and C3H6 
E)  none of the above

Question 10

The molecular weight of urea ( (NH2)2CO ), a compound used as a nitrogen fertilizer, is
Amu)

Accepted Answer

A)  43.0 
B)  8.0 
C)  44.0 
D)  32.0 
E)  60.1 
A)  43.0 
B)  8.0 
C)  44.0 
D)  32.0 
E)  60.1

Question 11

The formula weight of ammonium sulfate ((NH4)2SO4) is _ amu.

Accepted Answer

A)  264 
B)  100 
C)  132 
D)  116 
E)  118 
A)  264 
B)  100 
C)  132 
D)  116 
E)  118

Question 12

How many grams of hydrogen are in 46 g of CH4O?

Accepted Answer

A)  1.5 
B)  5.8 
C)  184 
D)  2.8 
E)  0.36 
A)  1.5 
B)  5.8 
C)  184 
D)  2.8 
E)  0.36

Question 13

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide:
 
A 1)50- g sample of CaO is reacted with 1.45 g of H2O. How many grams of water remains after completion of reaction?

Accepted Answer

A)  0.00 
B)  0.0536 
C)  0.966 
D)  1.04 
E)  0.00297 
A)  0.00 
B)  0.0536 
C)  0.966 
D)  1.04 
E)  0.00297

Question 14

The total number of atoms in 0.111 mol of Fe(CO)3(PH3)2 is _ .

Accepted Answer

A)  15 
B)  1.67 
C)  1.07 × 1024 
D)  2.76 × 10- 24 
E)  4.46 × 1021 
A)  15 
B)  1.67 
C)  1.07 × 1024 
D)  2.76 × 10- 24 
E)  4.46 × 1021

Question 15

When the following equation is balanced, the coefficient of oxygen is .

Accepted Answer

A)  3 
B)  4 
C)  2 
D)  5 
E)  1 
A)  3 
B)  4 
C)  2 
D)  5 
E)  1

Question 16

How many grams of oxygen are in 65 g of C2H2O2?

Accepted Answer

A)  18 
B)  130 
C)  29 
D)  9.0 
E)  36 
A)  18 
B)  130 
C)  29 
D)  9.0 
E)  36

Question 17

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements:
 
How many moles of N2 are produced by the decomposition of 2.88 mol of sodium azide?

Accepted Answer

A)  4.32 
B)  1.92 
C)  0.960 
D)  1.44 
E)  8.64 
A)  4.32 
B)  1.92 
C)  0.960 
D)  1.44 
E)  8.64

Question 18

The molecular weight of the ethanol (C2H5OH) is amu.

Accepted Answer

A)  30 
B)  92 
C)  34 
D)  41 
E)  46 
A)  30 
B)  92 
C)  34 
D)  41 
E)  46

Question 19

When the following equation is balanced, the coefficients are .

Accepted Answer

A)  2, 3, 2, 3 
B)  4, 6, 3, 2 
C)  2, 1, 3, 2 
D)  1, 1, 1, 1 
E)  2, 3, 1, 6 
A)  2, 3, 2, 3 
B)  4, 6, 3, 2 
C)  2, 1, 3, 2 
D)  1, 1, 1, 1 
E)  2, 3, 1, 6

Question 20

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide:
2Mg (s) + O2 (g) - 2MgO (s)
How many moles of O2 are consumed when 0.770 mol of magnesium burns?

Accepted Answer

A)  1.54 
B)  0.385 
C)  2.60 
D)  0.770 
E)  0.0317 
A)  1.54 
B)  0.385 
C)  2.60 
D)  0.770 
E)  0.0317

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

How many sulfur dioxide molecules are there in 0.180 mol of sulfur dioxide?

The combustion of propane (C3H8 ) in the presence of excess oxygen yields CO2 and H2O: C3H8 (g) + 5O2 (g) - 3CO2 (g) + 4H2O (g) When 7.3 g of C3H8 burns in the presence of excess O2, _ g of CO2 is produced.

When the following equation is balanced, the coefficient of H2SO4 is _ .

Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: How many grams of lead (II) oxide will be produced by the decomposition of 2.50 g of lead (II) carbonate?

How many moles of pyridine (C5H5N) are contained in 3.13 g of pyridine?

The mass % of F in the binary compound KrF2 is _ .

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 50.00 gram sample of the alcohol produced 95.50 grams of CO2 and 58.70 grams of H2O. What is the empirical formula of the alcohol?

Predict the product in the combination reaction below.

Which hydrocarbon pair below have identical mass percentage of C?

The molecular weight of urea ( (NH2)2CO ), a compound used as a nitrogen fertilizer, is Amu)

The formula weight of ammonium sulfate ((NH4)2SO4) is _ amu.

How many grams of hydrogen are in 46 g of CH4O?

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: A 1)50- g sample of CaO is reacted with 1.45 g of H2O. How many grams of water remains after completion of reaction?

The total number of atoms in 0.111 mol of Fe(CO)3(PH3)2 is _ .

When the following equation is balanced, the coefficient of oxygen is .

How many grams of oxygen are in 65 g of C2H2O2?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: How many moles of N2 are produced by the decomposition of 2.88 mol of sodium azide?

The molecular weight of the ethanol (C2H5OH) is amu.

When the following equation is balanced, the coefficients are .

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O2 (g) - 2MgO (s) How many moles of O2 are consumed when 0.770 mol of magnesium burns?

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

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The combustion of propane (C₃H₈) in the presence of excess oxygen yields CO₂and H₂O: C₃H₈(g) + 5O₂(g) - 3CO₂(g) + 4H₂O (g) When 7.3 g of C₃H₈burns in the presence of excess O₂, _ g of CO₂is produced.

When the following equation is balanced, the coefficient of H₂SO₄is _ .

How many moles of pyridine (C₅H₅N) are contained in 3.13 g of pyridine?

The mass % of F in the binary compound KrF₂is _ .

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 50.00 gram sample of the alcohol produced 95.50 grams of CO₂and 58.70 grams of H₂O. What is the empirical formula of the alcohol?

The molecular weight of urea ( (NH₂)₂CO ), a compound used as a nitrogen fertilizer, is Amu)

The formula weight of ammonium sulfate ((NH₄)₂SO₄) is _ amu.

How many grams of hydrogen are in 46 g of CH₄O?

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: A 1)50- g sample of CaO is reacted with 1.45 g of H₂O. How many grams of water remains after completion of reaction?

The total number of atoms in 0.111 mol of Fe(CO)₃(PH₃)₂is _ .

How many grams of oxygen are in 65 g of C₂H₂O₂?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: How many moles of N₂are produced by the decomposition of 2.88 mol of sodium azide?

The molecular weight of the ethanol (C₂H₅OH) is amu.

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O₂(g) - 2MgO (s) How many moles of O₂are consumed when 0.770 mol of magnesium burns?