Question 1

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

Accepted Answer

A)   0.00 829 g
B)   0. 417 g
C)   2. 40 g
D)   121 g

Question 2

Which of the following is one possible form of pentane?

Accepted Answer

A)   CH3CH2CH2CH2CH3
B)   CH3CH=CHCH2CH3
C)   CH3CH2CH2CH2CH2CH3
D)   CH3CH2CH2CH2CH2NH2
E)   CH3CH2-O-CH2CH2CH3

Question 3

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 molecules

Question 4

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g mL-1 and its molar mass is 86.18 g mol-1.

Accepted Answer

A)   8.59 mL
B)   13.5 mL
C)   7.40 mL
D)   12.4 mL
E)   11.6 mL

Question 5

Identify the formula for sulfurous acid.

Accepted Answer

A)   H2SO3
B)   HSO3
C)   H2SO4
D)   HSO4

Question 6

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 40.0 g of calcium fluoride?

Accepted Answer

A)   2.27 g
B)   7.70 g
C)   15.0 g
D)   20.5 g

Question 7

Calculate the mass percent composition of sulfur in Al2(SO4) 3.

Accepted Answer

A)   28.11%
B)   9.372%
C)   42.73%
D)   21.38%
E)   35.97%

Question 8

Identify the name for Sr(NO3) 2∙4H2O.

Accepted Answer

A)   tin(II)  nitrate tetrahydrate
B)   strontium nitrate tetrahydrate
C)   scandium nitrate tetrahydrate
D)   tin(III)  nitrate tetrahydrate
E)   tin(II)  nitrate quadhydrate

Question 9

Which of the following statements is TRUE?

Accepted Answer

A)   A molecular formula gives the actual number of atoms of each element in a molecule.
B)   The structural formula shows the geometry of the molecule.
C)   Metals and nonmetals bond to form a molecular compound.
D)   Covalently bonded nonmetals produce an ionic compound.
E)   Organic compounds containing double bonds between the carbon atoms are known as alkynes.

Question 10

Combustion analysis of an unknown hydrocarbon produced the following results: C 60.00%, H 4.48%, O 35.52%. Determine the empirical formula.

Accepted Answer

A)   C9H9O5
B)   C9H8O3
C)   C8H9O4
D)   C9H8O4
E)   C8H8O4

Question 11

Give the mass percent of carbon in C14H19NO2.

Accepted Answer

A)   38.89%
B)   71.46%
C)   5.17%
D)   2.78%

Question 12

The molecular weight of sucrose (C12H22O11) , table sugar, is ________ amu (rounded to one decimal place) .

Accepted Answer

A)   330.3
B)   342.3
C)   29.0
D)   45.0
E)   182.0

Question 13

What is the charge on an aluminum ion?

Accepted Answer

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

Question 14

Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams, of 3.14 × 1023 molecules of formic acid.

Accepted Answer

A)   0.0113 g
B)   0.0417 g
C)   24.0 g
D)   11.3 g
E)   0.0799 g

Question 15

The compound Cu( N O2) 2, is named ________.

Accepted Answer

A)   copper nitrite(II) 
B)   copper(I)  nitrite
C)   copper(I)  nitrite(II) 
D)   copper(II)  nitrite

Question 16

What is the common name of the polyatomic anion ClO4?

Accepted Answer

A)   Chlorite
B)   Chlorate
C)   Perchlorate
D)   Chloride
E)   Hypochlorite

Question 17

Determine the name for P4O10.

Accepted Answer

A)   phosphorus(IV)  oxide
B)   diphosphorus pentoxide
C)   phosphorus oxide
D)   phosphorus(II)  oxide
E)   tetraphosphorus decoxide

Question 18

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

Accepted Answer

A)   At
B)   At-
C)   At+
D)   At2

Question 19

Identify the charge, X, on the phosphide ion PX.

Accepted Answer

A)   -4
B)   -3
C)   -2
D)   -1
E)   +1

Question 20

Determine the molecular formula of a compound that has a molar mass of 183.2 g mol-1 and an empirical formula of C2H5O2.

Accepted Answer

A)   C2H5O2
B)   C6H15O6
C)   C3H7O3
D)   C4H10O4
E)   C8H20O8

Exam 3: Molecules, Compounds, and Nomenclature

Identify the name for Sr(NO3) 2∙4H2O.

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Which of the following statements is TRUE?

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Determine the name for P4O10.

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What is the charge on an aluminum ion?

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Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams, of 3.14 × 1023 molecules of formic acid.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The compound Cu( N O2) 2, is named ________.

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Give the mass percent of carbon in C14H19NO2.

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Identify the charge, X, on the phosphide ion PX.

Correct AnswerverifiedShow Answer

Determine the molecular formula of a compound that has a molar mass of 183.2 g mol-1 and an empirical formula of C2H5O2.

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Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g mL-1 and its molar mass is 86.18 g mol-1.

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Identify the formula for sulfurous acid.

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Which of the following is one possible form of pentane?

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The molecular weight of sucrose (C12H22O11) , table sugar, is ________ amu (rounded to one decimal place) .

Correct AnswerverifiedShow Answer

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

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What is the common name of the polyatomic anion ClO4?

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Calculate the mass percent composition of sulfur in Al2(SO4) 3.

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Combustion analysis of an unknown hydrocarbon produced the following results: C 60.00%, H 4.48%, O 35.52%. Determine the empirical formula.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 40.0 g of calcium fluoride?

Correct AnswerverifiedShow Answer

Identify the name for Sr(NO₃) ₂∙4H₂O.

Correct Answer
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Determine the name for P₄O₁₀.

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Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams, of 3.14 × 10²³molecules of formic acid.

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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The compound Cu( NO₂) ₂, is named ________.

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Give the mass percent of carbon in C₁₄H₁₉NO₂.

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Identify the charge, X, on the phosphide ion P^X.

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Determine the molecular formula of a compound that has a molar mass of 183.2 g mol^-1 and an empirical formula of C₂H₅O₂.

Correct Answer
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Determine the volume of hexane that contains 5.33 × 10²² molecules of hexane. The density of hexane is 0.6548 g mL^-1 and its molar mass is 86.18 g mol^-1.

Correct Answer
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The molecular weight of sucrose (C₁₂H₂₂O₁₁) , table sugar, is ________ amu (rounded to one decimal place) .

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What is the common name of the polyatomic anion ClO₄?

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Calculate the mass percent composition of sulfur in Al₂(SO₄) ₃.

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

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