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JAMB Chemistry 2014 Paper

Question : 2

Total: 45

What is the percentage of sulphur in sulphur (IV) oxide?

Solution:

Concept:

Sulphur (IV) oxide is

\mathrm{SO}_2

. Its percentage of sulphur is found from the molar masses of the elements.

Explanation:

Molar mass of sulphur,

\mathrm{S} = 32

g/mol.

Molar mass of oxygen,

\mathrm{O} = 16

g/mol.

Molar mass of

\mathrm{SO}_2 = 32 + 2(16) = 32 + 32 = 64

g/mol.

Percentage of sulphur

= \frac{\text{mass of S}}{\text{molar mass of } \mathrm{SO}_2} \times 100

= \frac{32}{64} \times 100 = 50\%

Answer:

D. 50%

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