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 gF) D) and E)
G) B) and E)

Question 2

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. F) C) and D)
G) A) and E)

Question 3

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.F) A) and C)
G) D) and E)

Question 4

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 10-24gF) A) and D)
G) A) and C)

Question 5

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 F) B) and D)
G) C) and D)

Question 6

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 moleculesF) C) and D)
G) A) and B)

Question 7

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 gF) B) and D)
G) All of the above

Question 8

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 kgF) A) and B)
G) B) and C)

Question 9

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 gF) All of the above
G) C) and D)

Question 10

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 gF) A) and C)
G) A) and B)

Question 11

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.H2OF) All of the above
G) A) and B)

Question 12

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 molF) All of the above
G) A) and E)

Question 13

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 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 atomsF) A) and E)
G) B) and D)

Question 15

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

Accepted Answer

Question 16

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. F) C) and D)
G) B) and E)

Question 17

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 mF) B) and D)
G) None of the above

Question 18

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 gF) A) and C)
G) B) and C)

Question 19

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 mF) A) and B)
G) B) and E)

Question 20

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)  C3H6ClF) A) and B)
G) A) and C)

Exam 3: Mass Relationships in Chemical Reactions

Correct Answer
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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?

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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)

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

What is the mass of 4.50 x 10²² Cu atoms?

Correct Answer
verified

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)

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

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

Correct Answer
verified

What is the mass of 8.25 × 10¹⁹ UF₆ molecules?

Correct Answer
verified

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)

Correct Answer
verified

Exam 3: Mass Relationships in Chemical Reactions

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the mass of 4.50 x 1022 Cu atoms?

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the mass of 8.25 × 1019 UF6 molecules?

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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)

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

What is the mass of 4.50 x 10²² Cu atoms?

Correct Answer
verified

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)

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

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

Correct Answer
verified

What is the mass of 8.25 × 10¹⁹ UF₆ molecules?

Correct Answer
verified

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)

Correct Answer
verified