Question 1

Calculate the mass of 3.7 moles of Br2.

Accepted Answer

590 g

Question 2

Ammonium nitrate decomposes to give dinitrogen monoxide and water as shown in the following reaction:
NH4NO3 $\rarr$ N2O + 2H2O
If a 108 g sample of NH4NO3 decomposes to give 23 g of N2O(g), what percent of the original sample remains?

Accepted Answer

61% remains

Question 3

What is the coefficient of O2 when the following equation is properly balanced? ___ CH3OH + ___ O2 $\rarr$ ___ CO2 + ___ H2O

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 7 
E) none of these 
A) 1 
B) 2 
C) 3 
D) 7 
E) none of these C

Question 4

What is the average mass of one S atom?

Accepted Answer

A) 32.07 g 
B) 32.07 amu 
C) 32.07 g/mol 
D) 5.32 x 10-23 amu 
E) 1.93 x 1025 g 
A) 32.07 g 
B) 32.07 amu 
C) 32.07 g/mol 
D) 5.32 x 10-23 amu 
E) 1.93 x 1025 g

Question 5

How many ICl3 molecules are present in 1.75 kg of ICl3?

Accepted Answer

Question 6

How many sulfur atoms are there in 21.0 g of Al2S3?

Accepted Answer

A) 8.42 × 1022 atoms 
B) 2.53 × 1023 atoms 
C) 2.14 × 1023 atoms 
D) 6.02 × 1023 atoms 
E) 6.30 × 1026 atoms 
A) 8.42 × 1022 atoms 
B) 2.53 × 1023 atoms 
C) 2.14 × 1023 atoms 
D) 6.02 × 1023 atoms 
E) 6.30 × 1026 atoms

Question 7

How many moles of O are in 2.45 moles of H2CO3?

Accepted Answer

A) 2.45 moles O 
B) 39.2 moles O 
C) 118 moles O 
D) 7.35 moles O 
E) 0.459 moles O 
A) 2.45 moles O 
B) 39.2 moles O 
C) 118 moles O 
D) 7.35 moles O 
E) 0.459 moles O

Question 8

Balance the following chemical equation:
C3H6O + O2 $\rarr$CO2 + H2O

Accepted Answer

Question 9

What is the coefficient for O2 when the following combustion reaction of a fatty acid is properly balanced? 
__ C18H36O2 + __ O2 $\rarr$ __ CO2 + __ H2O

Accepted Answer

A) 1 
B) 8 
C) 9 
D) 26 
E) 27 
A) 1 
B) 8 
C) 9 
D) 26 
E) 27

Question 10

A compound with an empirical formula of C2H2Br3 has a molar mass of 531.47 g/mol.What is the molecular formula?

Accepted Answer

A) C2H2Br3 
B) C4H4Br6 
C) CHBr 
D) C4H4Br3 
E) C6H6Br9 
A) C2H2Br3 
B) C4H4Br6 
C) CHBr 
D) C4H4Br3 
E) C6H6Br9

Question 11

Pressurized metal gas cylinders are generally used to store commonly used gases in the laboratory.At times, it can be easier to chemically prepare occasionally used gases..For example, oxygen gas can be prepared by heating KMnO4(s)according to the following chemical reaction:
2KMnO4(s)$\rarr$K2MnO4(s)+ MnO2(s)+ O2(g)
The above procedure was carried out starting with 93.2 g of KMnO4, and it was later determined that all of the KMnO4 reacted according to the above equation except 11.7 g.What was the percent yield for the reaction?

Accepted Answer

Question 12

What percent by mass of oxygen is present in carbon monoxide, CO?

Accepted Answer

The answer of What percent by mass of oxygen is...

Question 13

Refer to the (unbalanced)equation CS2 + CaO $\rarr$CO2 + CaS.How many grams of CaS are produced if 53 g of CO2 are produced?

Accepted Answer

Question 14

What is the molecular mass of nicotine, C10H14N2?

Accepted Answer

A) 27.03 amu 
B) 148.22 amu 
C) 149.13 amu 
D) 81.12 amu 
E) 162.23 amu 
A) 27.03 amu 
B) 148.22 amu 
C) 149.13 amu 
D) 81.12 amu 
E) 162.23 amu

Question 15

Chlorine gas reacts with phosphorus to produce phosphorus pentachloride.How many grams of PCl5 are produced from 3.5 g of Cl2 and excess P? 5Cl2(g)+ 2P(s)$\rarr$ 2PCl5(s)

Accepted Answer

A) 1.4 g 
B) 4.1 g 
C) 8.2 g 
D) 0.020 g 
E) 730 g 
A) 1.4 g 
B) 4.1 g 
C) 8.2 g 
D) 0.020 g 
E) 730 g

Question 16

What is the mass of 0.55 mole of C6H6?

Accepted Answer

A) 78.11 g 
B) 78.11 amu 
C) 42.96 g 
D) 42.96 amu 
E) 7.04 x 10-3 g 
A) 78.11 g 
B) 78.11 amu 
C) 42.96 g 
D) 42.96 amu 
E) 7.04 x 10-3 g

Question 17

How many grams of nitrogen are there in 7.5 g of Ca(NO3)2?

Accepted Answer

A) 0.64 g 
B) 1.3 g 
C) 0.15 g 
D) 1.2 g 
E) 2.3 g 
A) 0.64 g 
B) 1.3 g 
C) 0.15 g 
D) 1.2 g 
E) 2.3 g

Question 18

What is the minimum mass of water necessary to produce 200.g of sulfuric acid in the following reaction?
2SO2 + O2 + 2H2O $\rarr$2H2SO4

Accepted Answer

Question 19

One mole of iron

Accepted Answer

A) is heavier than one mole of lead (Pb). 
B) is 77.0 g of iron. 
C) is 26.0 g of iron. 
D) weighs the same as one mole of lead. 
E) None of the above. 
A) is heavier than one mole of lead (Pb). 
B) is 77.0 g of iron. 
C) is 26.0 g of iron. 
D) weighs the same as one mole of lead. 
E) None of the above.

Question 20

Pressurized metal gas cylinders are generally used to store commonly used gases in the laboratory.At times, it can be easier to chemically prepare occasionally used gases..For example, oxygen gas can be prepared by heating KMnO4(s)according to the following chemical reaction:
2KMnO4(s)$\rarr$ K2MnO4(s)+ MnO2(s)+ O2(g)
How many grams of KMnO4 would you need to produce 0.27 moles of O2, assuming 100% conversion? The molar mass of KMnO4 is 158.034 g/mol.

Accepted Answer

Exam 3: Mass Relationships in Chemical Reactions

Calculate the mass of 3.7 moles of Br2.

Ammonium nitrate decomposes to give dinitrogen monoxide and water as shown in the following reaction: NH4NO3 →\rarr→ N2O + 2H2O If a 108 g sample of NH4NO3 decomposes to give 23 g of N2O(g), what percent of the original sample remains?

What is the coefficient of O2 when the following equation is properly balanced? ___ CH3OH + ___ O2 →\rarr→ ___ CO2 + ___ H2O

What is the average mass of one S atom?

How many ICl3 molecules are present in 1.75 kg of ICl3?

How many sulfur atoms are there in 21.0 g of Al2S3?

How many moles of O are in 2.45 moles of H2CO3?

Balance the following chemical equation: C3H6O + O2 →\rarr→ CO2 + H2O

What is the coefficient for O2 when the following combustion reaction of a fatty acid is properly balanced? __ C18H36O2 + __ O2 →\rarr→ __ CO2 + __ H2O

A compound with an empirical formula of C2H2Br3 has a molar mass of 531.47 g/mol.What is the molecular formula?

What percent by mass of oxygen is present in carbon monoxide, CO?

Refer to the (unbalanced)equation CS2 + CaO →\rarr→ CO2 + CaS.How many grams of CaS are produced if 53 g of CO2 are produced?

What is the molecular mass of nicotine, C10H14N2?

Chlorine gas reacts with phosphorus to produce phosphorus pentachloride.How many grams of PCl5 are produced from 3.5 g of Cl2 and excess P? 5Cl2(g)+ 2P(s) →\rarr→ 2PCl5(s)

What is the mass of 0.55 mole of C6H6?

How many grams of nitrogen are there in 7.5 g of Ca(NO3)2?

What is the minimum mass of water necessary to produce 200.g of sulfuric acid in the following reaction? 2SO2 + O2 + 2H2O →\rarr→ 2H2SO4

One mole of iron

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Calculate the mass of 3.7 moles of Br₂.

Ammonium nitrate decomposes to give dinitrogen monoxide and water as shown in the following reaction: NH₄NO₃ $\rarr$ N₂O + 2H₂O If a 108 g sample of NH₄NO₃ decomposes to give 23 g of N₂O(g), what percent of the original sample remains?

What is the coefficient of O₂ when the following equation is properly balanced? _ CH₃OH + _ O₂ $\rarr$ _ CO₂ + _ H₂O

How many ICl₃ molecules are present in 1.75 kg of ICl₃?

How many sulfur atoms are there in 21.0 g of Al₂S₃?

How many moles of O are in 2.45 moles of H₂CO₃?

Balance the following chemical equation: C₃H₆O + O₂ $\rarr$ CO₂ + H₂O

What is the coefficient for O₂ when the following combustion reaction of a fatty acid is properly balanced? C₁₈H₃₆O₂ + O₂ $\rarr$ CO₂ + H₂O

A compound with an empirical formula of C₂H₂Br₃ has a molar mass of 531.47 g/mol.What is the molecular formula?

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS.How many grams of CaS are produced if 53 g of CO₂ are produced?

What is the molecular mass of nicotine, C₁₀H₁₄N₂?

Chlorine gas reacts with phosphorus to produce phosphorus pentachloride.How many grams of PCl₅ are produced from 3.5 g of Cl₂ and excess P? 5Cl₂(g)+ 2P(s) $\rarr$ 2PCl₅(s)

What is the mass of 0.55 mole of C₆H₆?

How many grams of nitrogen are there in 7.5 g of Ca(NO₃)₂?

What is the minimum mass of water necessary to produce 200.g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄