Question
Asked Oct 25, 2019
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Which one of the following has the smallest mass percent of F in the compound?
A) SF₆
B) NaF
C) XeF₂
D) KrF₄
 
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Expert Answer

Step 1

The mass percentage of fluorine is 78.04 %.

a) SF6
Molar mass of SF6 is 146.06 g/mol
Molar mass of fluorine is 18.998403 g/mol
The mass percentage of fluorine is calculated as follows,
mass of F
The mass percent of F =
x 100
Total mass
6x18.998 g/mol
The mass percent of F
x 100
146.06 g/mol
The mass percent of F 0.1300 x 100
The mass percent of F = 78.04 %
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a) SF6 Molar mass of SF6 is 146.06 g/mol Molar mass of fluorine is 18.998403 g/mol The mass percentage of fluorine is calculated as follows, mass of F The mass percent of F = x 100 Total mass 6x18.998 g/mol The mass percent of F x 100 146.06 g/mol The mass percent of F 0.1300 x 100 The mass percent of F = 78.04 %

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Step 2

The mass percentage of fluorine is 45.25 %.

b) NaF
Molar mass of NaF is 41.98817 g/mol
Molar mass of fluorine is 18.998403 g/mol
The mass percentage of fluorine is calculated as follows,
mass of F
The mass percent of F =
x 100
Total mass
18.998 g/mol
The mass percent of F
x 100
41.98817 g/mol
The mass percent of F 0.4525 x 100
The mass percent of F = 45.25%
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b) NaF Molar mass of NaF is 41.98817 g/mol Molar mass of fluorine is 18.998403 g/mol The mass percentage of fluorine is calculated as follows, mass of F The mass percent of F = x 100 Total mass 18.998 g/mol The mass percent of F x 100 41.98817 g/mol The mass percent of F 0.4525 x 100 The mass percent of F = 45.25%

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Step 3

The mass percentage of fl...

c) XeF2
Molar mass of XeF2 is 169.2898 g/mol
Molar mass of fluorine is 18.998403 g/mol
The mass percentage of fluorine is calculated as follows,
mass of F
The mass percent of F
x 100
Total mass
2x18.998 g/mol
169.2898 g/mo
x 100
The mass percent of F
The mass percent of F = 0.2244 x 100
The mass percent of F = 22.44 %
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c) XeF2 Molar mass of XeF2 is 169.2898 g/mol Molar mass of fluorine is 18.998403 g/mol The mass percentage of fluorine is calculated as follows, mass of F The mass percent of F x 100 Total mass 2x18.998 g/mol 169.2898 g/mo x 100 The mass percent of F The mass percent of F = 0.2244 x 100 The mass percent of F = 22.44 %

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