Question 1

Identify the formula for barium hydroxide octahydrate.

Accepted Answer

A)  Ba(OH) 2∙8H2O
B)  BaOH∙8H2O
C)  B(OH) 3∙8H2O
D)  8Ba(OH) 2∙H2O
E)  8BaOH∙H2OF) A) and E)
G) D) and E)

Question 2

What is the charge on the Cr ions in Cr2O3?

Accepted Answer

A)  2-
B)  1+
C)  2+
D)  3+E) B) and C)
F) A) and D)

Question 3

Which of the following is an ionic compound?

Accepted Answer

A)  LiCl
B)  NO2
C)  PCl3
D)  CF4
E)  SeBr2F) B) and E)
G) A) and E)

Question 4

What is the empirical formula of a compound that is 66.6% C,11.2% H,and 22.2% O by mass?

Accepted Answer

A)  C5H10O2
B)  C8HO4
C)  C6H12O2
D)  C4H8O
E)  C4H2OF) A) and C)
G) A) and B)

Question 5

Which of the following is the correct chemical formula for a molecule of astatine?

Accepted Answer

A)  At
B)  At-
C)  At+
D)  At2E) C) and D)
F) B) and C)

Question 6

Which of the following has the greatest mass?

Accepted Answer

A)  3.88 × 1022 molecules of O2
B)  1.00 g of O2
C)  0.0312 mol of O2
D)  All of the above have the same mass.E) All of the above
F) None of the above

Question 7

What is the mass of 8.50 × 1022 molecules of NH3?

Accepted Answer

A)  0.00829 g
B)  0.417 g
C)  2.40 g
D)  121 gE) All of the above
F) A) and B)

Question 8

Describe the difference between a molecular formula and an empirical formula.Give an example.

Accepted Answer

A molecular formula is the exact number ...

Question 9

What is the empirical formula for C4H10O2?

Accepted Answer

A)  C2H5O
B)  CHO
C)  C2H4O
D)  CHO2
E)  CH2OF) All of the above
G) A) and D)

Question 10

Combustion analysis of 63.8 mg of a C,H,and O-containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O.What is the empirical formula for the compound?

Accepted Answer

A)  C5H2O
B)  CHO
C)  C3H6O
D)  C3H7O
E)  C6HO3F) B) and E)
G) None of the above

Question 11

What is the mass of 0.500 mol of dichlorodifluoromethane,CCl2F2?

Accepted Answer

A)  4.14 × 10-3 g
B)  60.5 g
C)  121 g
D)  242 gE) A) and B)
F) A) and C)

Question 12

Determine the name for TiCO3.Remember that titanium forms several ions.

Accepted Answer

A)  titanium(II) carbonate
B)  titanium carbide
C)  titanium carbonite
D)  titanium(II) carbonite
E)  titanium(I) carbonateF) A) and D)
G) D) and E)

Question 13

Identify the formula for sodium chlorate.

Accepted Answer

A)  NaClO
B)  NaClO2
C)  NaClO3
D)  NaClO4E) A) and D)
F) B) and C)

Question 14

What is the correct formula for lead (II) chloride?

Accepted Answer

A)  LdCl4
B)  SbCl4
C)  PbCl2
D)  PbCl4
E)  LaCl3F) A) and D)
G) A) and C)

Question 15

Combustion analysis of 1.200 g of an unknown compound containing carbon,hydrogen,and oxygen produced 2.086 g of CO2 and 1.134 g of H2O.What is the empirical formula of the compound?

Accepted Answer

A)  C2H5O
B)  C2H5O2
C)  C2H10O3
D)  C3H8O2E) B) and C)
F) A) and C)

Question 16

How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g mol-1.

Accepted Answer

A)  9.83 × 1020 C2H4 molecules
B)  7.74 × 1026 C2H4 molecules
C)  2.71 × 1020 C2H4 molecules
D)  3.69 × 1023 C2H4 molecules
E)  4.69 × 1023 C2H4 moleculesF) A) and B)
G) A) and C)

Question 17

Determine the name for N2O5.

Accepted Answer

A)  dinitrogen pentoxide
B)  nitrogen oxide
C)  nitrogen(IV) oxide
D)  nitrogen(II) oxide
E)  nitrogen tetroxideF) B) and C)
G) C) and D)

Question 18

Hematite is the mineral form of iron(III) oxide.Calculate the number of iron ions in 20.0 kg of pure hematite.

Accepted Answer

A)  1.51 × 1026 
B)  7.54 × 1025
C)  3.77 × 1017
D)  6.63 × 10-27
E)  9.62 × 1021F) A) and B)
G) B) and D)

Question 19

How many molecules of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g mol-1.

Accepted Answer

A)  5.54 × 1025 N2O4 molecules
B)  7.26 × 1023 N2O4 molecules
C)  1.38 × 1024 N2O4 molecules
D)  4.59 × 1025 N2O4 molecules
E)  4.99 × 1023 N2O4 moleculesF) None of the above
G) A) and D)

Question 20

Identify the compound with (an) ionic bond(s) .

Accepted Answer

A)  SO2
B)  CO
C)  O2
D)  H2O
E)  KBrF) A) and B)
G) All of the above

Exam 3: Molecules,compounds,and Nomenclature

What is the correct formula for lead (II) chloride?

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Describe the difference between a molecular formula and an empirical formula.Give an example.

Correct AnswerverifiedA molecular formula is the exact number ...View AnswerShow Answer

Hematite is the mineral form of iron(III) oxide.Calculate the number of iron ions in 20.0 kg of pure hematite.

Correct AnswerverifiedShow Answer

Combustion analysis of 63.8 mg of a C,H,and O-containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O.What is the empirical formula for the compound?

Correct AnswerverifiedShow Answer

Identify the compound with (an) ionic bond(s) .

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How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g mol-1.

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Which of the following is the correct chemical formula for a molecule of astatine?

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What is the charge on the Cr ions in Cr2O3?

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Determine the name for N2O5.

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What is the empirical formula of a compound that is 66.6% C,11.2% H,and 22.2% O by mass?

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Which of the following has the greatest mass?

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What is the empirical formula for C4H10O2?

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Identify the formula for barium hydroxide octahydrate.

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Combustion analysis of 1.200 g of an unknown compound containing carbon,hydrogen,and oxygen produced 2.086 g of CO2 and 1.134 g of H2O.What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

How many molecules of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g mol-1.

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What is the mass of 0.500 mol of dichlorodifluoromethane,CCl2F2?

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What is the mass of 8.50 × 1022 molecules of NH3?

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Which of the following is an ionic compound?

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Identify the formula for sodium chlorate.

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Determine the name for TiCO3.Remember that titanium forms several ions.

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A molecular formula is the exact number ...
View Answer

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Combustion analysis of 63.8 mg of a C,H,and O-containing compound produced 145.0 mg of CO₂ and 59.38 mg of H₂O.What is the empirical formula for the compound?

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Correct Answer
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How many C₂H₄ molecules are contained in 45.8 mg of C₂H₄? The molar mass of C₂H₄ is 28.05 g mol^-1.

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What is the charge on the Cr ions in Cr₂O₃?

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Determine the name for N₂O₅.

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What is the empirical formula for C₄H₁₀O₂?

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Combustion analysis of 1.200 g of an unknown compound containing carbon,hydrogen,and oxygen produced 2.086 g of CO₂ and 1.134 g of H₂O.What is the empirical formula of the compound?

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How many molecules of N₂O₄ are in 76.3 g N₂O₄? The molar mass of N₂O₄ is 92.02 g mol^-1.

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What is the mass of 0.500 mol of dichlorodifluoromethane,CCl₂F₂?

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What is the mass of 8.50 × 10²² molecules of NH₃?

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Determine the name for TiCO₃.Remember that titanium forms several ions.

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