Question 1

Calculate the mass of 0.00456 moles of (NH4)2SO4

Accepted Answer

A) 132 g 
B) 3.45 x 10-5 g 
C) 114 g 
D) 0.603 g 
E) 0.520 g 
A) 132 g 
B) 3.45 x 10-5 g 
C) 114 g 
D) 0.603 g 
E) 0.520 g

Question 2

Calculate the molecular mass of ethylene glycol, C2H6O2, a compound frequently used as automobile antifreeze.

Accepted Answer

Question 3

Washing soda is a hydrate of sodium carbonate.Elemental analysis of a sample of washing soda gave 4.20% C and 7.05% H.What is the formula for washing soda?

Accepted Answer

A) Na2CO3.2H2O 
B) Na2CO3.4H2O 
C) Na2CO3.6H2O 
D) Na2CO3.8H2O 
E) Na2CO3.H2O 
A) Na2CO3.2H2O 
B) Na2CO3.4H2O 
C) Na2CO3.6H2O 
D) Na2CO3.8H2O 
E) Na2CO3.H2O

Question 4

What is the mass of 3.00 moles of ethanol, C2H6O?

Accepted Answer

A) 4.99 × 10-24 g 
B) 138 g 
C) 6.52 × 10-2 g 
D) 50.0 g 
E) 1.81 × 1024 g 
A) 4.99 × 10-24 g 
B) 138 g 
C) 6.52 × 10-2 g 
D) 50.0 g 
E) 1.81 × 1024 g

Question 5

A copper wire has a diameter of 2.00 mm.What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm3)

Accepted Answer

A) 0.178 m 
B) 0.567 m 
C) 180 m 
D) 45.1 m 
E) 2.27 m 
A) 0.178 m 
B) 0.567 m 
C) 180 m 
D) 45.1 m 
E) 2.27 m

Question 6

What is the average mass, in grams, of one Zn atom?

Accepted Answer

A) 65.39 amu 
B) 65.39 g 
C) 3.94 x 1025g 
D) 1.09 x 10-22 g 
E) 1.661 x 10-24g 
A) 65.39 amu 
B) 65.39 g 
C) 3.94 x 1025g 
D) 1.09 x 10-22 g 
E) 1.661 x 10-24g

Question 7

How many moles of O atoms are in 25.7 g of CaSO4?

Accepted Answer

A) 0.189 mol 
B) 0.755 mol 
C) 4.00 mol 
D) 1.14 × 1023 mol 
E) 4.55 × 1023 mol 
A) 0.189 mol 
B) 0.755 mol 
C) 4.00 mol 
D) 1.14 × 1023 mol 
E) 4.55 × 1023 mol

Question 8

An atom of bromine has a mass about four times greater than that of an atom of neon.Which choice makes the correct comparison of the relative numbers of bromine and neon atoms in 1,000 g of each element?

Accepted Answer

A) The number of bromine and neon atoms is the same. 
B) There are one thousand times as many bromine atoms as neon atoms. 
C) There are one thousand times as many neon atoms as bromine atoms. 
D) There are four times as many neon atoms as bromine atoms. 
E) There are four times as many bromine atoms as neon atoms. 
A) The number of bromine and neon atoms is the same. 
B) There are one thousand times as many bromine atoms as neon atoms. 
C) There are one thousand times as many neon atoms as bromine atoms. 
D) There are four times as many neon atoms as bromine atoms. 
E) There are four times as many bromine atoms as neon atoms.

Question 9

When 22.0 g NaCl and 21.0 g H2SO4 are mixed and react according to the equation below, which is the limiting reagent? 
2NaCl + H2SO4 $\rarr$Na2SO4 + 2HCl

Accepted Answer

A) NaCl 
B) H2SO4 
C) Na2SO4 
D) HCl 
E) No reagent is limiting. 
A) NaCl 
B) H2SO4 
C) Na2SO4 
D) HCl 
E) No reagent is limiting.

Question 10

What is the mass of 8.25 × 1019 UF6 molecules?

Accepted Answer

A) 352 g 
B) 0.0482 g 
C) 1.37 × 10-4 g 
D) 2.90 × 1022 g 
E) 8.25 × 1019 g 
A) 352 g 
B) 0.0482 g 
C) 1.37 × 10-4 g 
D) 2.90 × 1022 g 
E) 8.25 × 1019 g

Question 11

An unknown compound with a molar mass of 155.06 g/mol consists of 46.47% C, 7.80% H, and 45.72% Cl.Find the molecular formula for the compound.

Accepted Answer

A) CHCl 
B) C9H18Cl3 
C) C6H12Cl 
D) C6H12Cl2 
E) C3H6Cl 
A) CHCl 
B) C9H18Cl3 
C) C6H12Cl 
D) C6H12Cl2 
E) C3H6Cl

Question 12

How many molecules are there in 8.0 g of ozone, O3?

Accepted Answer

A) 3.0 molecules 
B) 3.6 × 1024 molecules 
C) 1.0 × 1023 molecules 
D) 3.0 × 1023 molecules 
E) 6.0 × 1023 molecules 
A) 3.0 molecules 
B) 3.6 × 1024 molecules 
C) 1.0 × 1023 molecules 
D) 3.0 × 1023 molecules 
E) 6.0 × 1023 molecules

Question 13

Liquid heptane, C7H16 , burns in oxygen gas to yield carbon dioxide and water.What mass of carbon dioxide is produced when 15.0 mL of heptane burns completely? (density of heptane = 0.6838 g/mL)

Accepted Answer

A) 4.49 g 
B) 6.59 g 
C) 31.5 g 
D) 46.1 g 
E) 71.8 g 
A) 4.49 g 
B) 6.59 g 
C) 31.5 g 
D) 46.1 g 
E) 71.8 g

Question 14

How many carbon atoms are there in 15 lbs of sugar, C12H22O11?

Accepted Answer

A) 4.1 x 1028 C atoms 
B) 1.2 x 1026 C atoms 
C) 1.4 x 1026 C atoms 
D) 2.6 x 1022 C atoms 
E) 3.2 x 1023 C atoms 
A) 4.1 x 1028 C atoms 
B) 1.2 x 1026 C atoms 
C) 1.4 x 1026 C atoms 
D) 2.6 x 1022 C atoms 
E) 3.2 x 1023 C atoms

Question 15

A gold wire has a diameter of 1.00 mm.What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm3)

Accepted Answer

A) 2630 m 
B) 3.69 m 
C) 251 m 
D) 14.8 m 
E) 62.7 m 
A) 2630 m 
B) 3.69 m 
C) 251 m 
D) 14.8 m 
E) 62.7 m

Question 16

What is the mass of 4.50 x 1022 Cu atoms?

Accepted Answer

A) 7.47 x 10-2 g 
B) 7.47 x 10-2 amu 
C) 4.75 g 
D) 63.55 amu 
E) 63.55 g 
A) 7.47 x 10-2 g 
B) 7.47 x 10-2 amu 
C) 4.75 g 
D) 63.55 amu 
E) 63.55 g

Question 17

Balance the following equation and list the coefficients in order from left to right. __ SF4 + __ H2O $\rarr$ __ H2SO3 + __ HF

Accepted Answer

A) 1, 1, 1, 4 
B) 2, 6, 2, 8 
C) 1, 2, 1, 4 
D) 1, 3, 1, 4 
E) 2, 3, 2, 8 
A) 1, 1, 1, 4 
B) 2, 6, 2, 8 
C) 1, 2, 1, 4 
D) 1, 3, 1, 4 
E) 2, 3, 2, 8

Question 18

A method for producing pure copper metal involves the reaction of copper(I)sulfide with oxygen gas to give copper metal and sulfur dioxide.Suppose the yield of this reaction is 87%.What mass of a copper ore consisting of 46% copper(I)sulfide must be mined in order to produce 1.0 × 103 kg (1.0 metric ton)of copper metal?

Accepted Answer

A) 1.3 × 103 kg 
B) 1.4× 103 kg 
C) 1.5 × 103 kg 
D) 3.2 × 103 kg 
E) 8.0 × 103 kg 
A) 1.3 × 103 kg 
B) 1.4× 103 kg 
C) 1.5 × 103 kg 
D) 3.2 × 103 kg 
E) 8.0 × 103 kg

Question 19

What mass of sodium nitrate would be produced from the complete reaction of 1.00 mol of lead nitrate?
2 NaCl + Pb(NO3 )2 $\rarr$ 2 NaNO3 + PbCl2

Accepted Answer

Question 20

Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO2(s)+ 4HCl(aq)$\rarr$ MnCl2(aq)+ 2H2O(l)+ Cl2(g)
According to the above reaction, deterrmine the limiting reactant when 5.6 moles of MnO2 are reacted with 7.5 moles of HCl?

Accepted Answer

A) MnO2 
B) HCl 
C) MnCl2 
D) Cl2 
E) No reagent is limiting. 
A) MnO2 
B) HCl 
C) MnCl2 
D) Cl2 
E) No reagent is limiting.

Exam 3: Mass Relationships in Chemical Reactions

Calculate the mass of 0.00456 moles of (NH4)2SO4

Calculate the molecular mass of ethylene glycol, C2H6O2, a compound frequently used as automobile antifreeze.

Washing soda is a hydrate of sodium carbonate.Elemental analysis of a sample of washing soda gave 4.20% C and 7.05% H.What is the formula for washing soda?

What is the mass of 3.00 moles of ethanol, C2H6O?

A copper wire has a diameter of 2.00 mm.What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm3)

What is the average mass, in grams, of one Zn atom?

How many moles of O atoms are in 25.7 g of CaSO4?

An atom of bromine has a mass about four times greater than that of an atom of neon.Which choice makes the correct comparison of the relative numbers of bromine and neon atoms in 1,000 g of each element?

When 22.0 g NaCl and 21.0 g H2SO4 are mixed and react according to the equation below, which is the limiting reagent? 2NaCl + H2SO4 →\rarr→ Na2SO4 + 2HCl

What is the mass of 8.25 × 1019 UF6 molecules?

An unknown compound with a molar mass of 155.06 g/mol consists of 46.47% C, 7.80% H, and 45.72% Cl.Find the molecular formula for the compound.

How many molecules are there in 8.0 g of ozone, O3?

Liquid heptane, C7H16 , burns in oxygen gas to yield carbon dioxide and water.What mass of carbon dioxide is produced when 15.0 mL of heptane burns completely? (density of heptane = 0.6838 g/mL)

How many carbon atoms are there in 15 lbs of sugar, C12H22O11?

A gold wire has a diameter of 1.00 mm.What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm3)

What is the mass of 4.50 x 1022 Cu atoms?

Balance the following equation and list the coefficients in order from left to right. __ SF4 + __ H2O →\rarr→ __ H2SO3 + __ HF

What mass of sodium nitrate would be produced from the complete reaction of 1.00 mol of lead nitrate? 2 NaCl + Pb(NO3 )2 →\rarr→ 2 NaNO3 + PbCl2

Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO2(s)+ 4HCl(aq) →\rarr→ MnCl2(aq)+ 2H2O(l)+ Cl2(g) According to the above reaction, deterrmine the limiting reactant when 5.6 moles of MnO2 are reacted with 7.5 moles of HCl?

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

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Filters

Calculate the mass of 0.00456 moles of (NH₄)₂SO₄

Calculate the molecular mass of ethylene glycol, C₂H₆O₂, a compound frequently used as automobile antifreeze.

What is the mass of 3.00 moles of ethanol, C₂H₆O?

A copper wire has a diameter of 2.00 mm.What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm³)

How many moles of O atoms are in 25.7 g of CaSO₄?

When 22.0 g NaCl and 21.0 g H₂SO₄ are mixed and react according to the equation below, which is the limiting reagent? 2NaCl + H₂SO₄ $\rarr$ Na₂SO₄ + 2HCl

What is the mass of 8.25 × 10¹⁹ UF₆ molecules?

How many molecules are there in 8.0 g of ozone, O₃?

Liquid heptane, C₇H₁₆, burns in oxygen gas to yield carbon dioxide and water.What mass of carbon dioxide is produced when 15.0 mL of heptane burns completely? (density of heptane = 0.6838 g/mL)

How many carbon atoms are there in 15 lbs of sugar, C₁₂H₂₂O₁₁?

A gold wire has a diameter of 1.00 mm.What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm³)

What is the mass of 4.50 x 10²² Cu atoms?

Balance the following equation and list the coefficients in order from left to right. SF₄ + H₂O $\rarr$ H₂SO₃ + HF

What mass of sodium nitrate would be produced from the complete reaction of 1.00 mol of lead nitrate? 2 NaCl + Pb(NO₃)₂ $\rarr$ 2 NaNO₃ + PbCl₂

Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO₂(s)+ 4HCl(aq) $\rarr$ MnCl₂(aq)+ 2H₂O(l)+ Cl₂(g) According to the above reaction, deterrmine the limiting reactant when 5.6 moles of MnO₂ are reacted with 7.5 moles of HCl?