Question 1

Determine the molecular formula of a compound that has a molar mass of 92.0 g mol-1 and an empirical formula of NO2.

Accepted Answer

A)   N2O3
B)   N3O6
C)   N2O4
D)   NO2
E)   N2O5

Question 2

Identify a possible molecular formula for a compound with an empirical formula C3H5ClO.

Accepted Answer

A)   C6H10ClO2
B)   C5H10Cl2O2
C)   C6H10Cl2O2
D)   C6H10O2
E)   C6H12Cl2O2

Question 3

Which of the following statements is FALSE?

Accepted Answer

A)   Hydrocarbons are organic compounds.
B)   Organic compounds are composed of nitrogen, oxygen, and sulfur.
C)   The three types of hydrocarbons are alkane, alkene, and alkynes.
D)   All organic compounds can be classified as hydrocarbons with one or more functional groups.
E)   The commonly known functionalized hydrocarbons are alcohols, ethers, aldehydes, ketones, esters, carboxylic acids, and amines.

Question 4

How many moles of C3H8 contain 9.25 × 1024 molecules of C3H8?

Accepted Answer

A)   65.1 moles C3H8
B)   28.6 moles C3H8
C)   34.9 moles C3H8
D)   46.2 moles C3H8
E)   15.4 moles C3H8

Question 5

Match the following.
-hydrogen

Accepted Answer

A)  Ne(g) 
B)  Cl2(g) 
C)  Ca2(s) 
D)  Ne2(g) 
E)  Ca(s) F) H2(g) G) I2(s) H) H(g) I) Cl(g) J) O(g) K) O2(g) L) I(s)

Question 6

How many cations are there in 10.0 g of sodium phosphate?

Accepted Answer

A)   3.67 × 1022 cations
B)   1.10 × 1023 cations
C)   9.87 × 1024 cations
D)   2.96 × 1025 cations

Question 7

In which set do all elements tend to form cations in binary ionic compounds?

Accepted Answer

A)   K, Ga, O
B)   Sr, Ni, Hg
C)   N, P, Bi
D)   O, Br, I

Question 8

Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass.

Accepted Answer

A)   NO
B)   N2O
C)   NO2
D)   N2O3
E)   NO3

Question 9

Identify the formula for sodium chlorate.

Accepted Answer

A)   NaClO
B)   NaClO2
C)   NaClO3
D)   NaClO4

Question 10

Identify a carboxylic acid.

Accepted Answer

A)   CH3CH2OCH2CH3
B)   CH3CH2OH
C)   CH3CH2NH2
D)   CH3CH2CH2CH3
E)   CH3COOH

Question 11

How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g mol-1.

Accepted Answer

A)   1.52 × 1027 sodium ions
B)   4.76 × 1020 sodium ions
C)   2.10 × 1021 sodium ions
D)   1.05 × 1021 sodium ions
E)   9.52 × 1020 sodium ions

Question 12

Calculate the molar mass for Mg(ClO4) 2.

Accepted Answer

A)   223.21 g mol-1
B)   123.76 g mol-1
C)   119.52 g mol-1
D)   247.52 g mol-1
E)   75.76 g mol-1

Question 13

Match the following.
-oxygen

Accepted Answer

A)  Ne(g) 
B)  Cl2(g) 
C)  Ca2(s) 
D)  Ne2(g) 
E)  Ca(s) F) H2(g) G) I2(s) H) H(g) I) Cl(g) J) O(g) K) O2(g) L) I(s)

Question 14

How many molecules are in 0.1339 kg of ethanol,C2H6O?

Accepted Answer

A)   1.750 × 1024
B)   3.715 × 1027
C)   5.712 × 10-25
D)   9.763 × 1019
E)   9.763 × 1022

Question 15

What is the molar mass of nitrogen gas?

Accepted Answer

A)   14.0 g mol-1
B)   28.0 g mol-1
C)   6.02 × 1023 g mol-1
D)   1.20 × 1023 g mol-1

Question 16

What type of bonding is found in the compound O F2?

Accepted Answer

A)   covalent bonding
B)   hydrogen bonding
C)   ionic bonding
D)   metallic bonding

Question 17

How many Fe(II)  ions are there in 20.0 g of FeSO4?

Accepted Answer

A)   2.19 × 10-25 iron(II)  ions
B)   7.92 × 1022 iron(II)  ions
C)   4.57 × 1024 iron(II)  ions
D)   1.82 × 1027 iron(II)  ions

Question 18

Identify the perchlorate ion.

Accepted Answer

A)   Cl -" class="answers-bank-image d-inline" rel="preload" >
B)   Cl -" class="answers-bank-image d-inline" rel="preload" >
C)   Cl -" class="answers-bank-image d-inline" rel="preload" >
D)   Cl -" class="answers-bank-image d-inline" rel="preload" >
E)   Cl-

Question 19

How many moles of PCl3 contain 3.68 × 1025 chlorine atoms?

Accepted Answer

A)   61.1 moles PCl3
B)   20.4 moles PCl3
C)   16.4 moles PCl3
D)   54.5 moles PCl3
E)   49.1 moles PCl3

Question 20

Identify a hydrocarbon.

Accepted Answer

A)   CH3CH2OCH2CH3
B)   CH3CH2OH
C)   CH3CH2NH2
D)   CH3CH2CH2CH3
E)   CH3COOH

Exam 3: Molecules, Compounds, and Nomenclature

Identify a hydrocarbon.

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Which of the following statements is FALSE?

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Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass.

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How many molecules are in 0.1339 kg of ethanol,C2H6O?

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How many Fe(II) ions are there in 20.0 g of FeSO4?

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Identify a carboxylic acid.

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Calculate the molar mass for Mg(ClO4) 2.

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How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g mol-1.

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Identify the formula for sodium chlorate.

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In which set do all elements tend to form cations in binary ionic compounds?

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Match the following. -oxygen

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What is the molar mass of nitrogen gas?

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How many moles of C3H8 contain 9.25 × 1024 molecules of C3H8?

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How many moles of PCl3 contain 3.68 × 1025 chlorine atoms?

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Match the following. -hydrogen

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Determine the molecular formula of a compound that has a molar mass of 92.0 g mol-1 and an empirical formula of NO2.

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Identify the perchlorate ion.

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Identify a possible molecular formula for a compound with an empirical formula C3H5ClO.

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What type of bonding is found in the compound O F2?

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How many cations are there in 10.0 g of sodium phosphate?

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How many molecules are in 0.1339 kg of ethanol,C₂H₆O?

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How many Fe(II) ions are there in 20.0 g of FeSO₄?

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Calculate the molar mass for Mg(ClO₄) ₂.

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How many sodium ions are contained in 99.6 mg of Na₂SO₃? The molar mass of Na₂SO₃is 126.05 g mol^-1.

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How many moles of C₃H₈ contain 9.25 × 10²⁴ molecules of C₃H₈?

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How many moles of PCl₃ contain 3.68 × 10²⁵ chlorine atoms?

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Determine the molecular formula of a compound that has a molar mass of 92.0 g mol^-1 and an empirical formula of NO₂.

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Identify a possible molecular formula for a compound with an empirical formula C₃H₅ClO.

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What type of bonding is found in the compound O F₂?

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