Number of hydrogen atoms per molecule of a hydrocarbon ... | null (Chemistry) | DivineJEE

Exam

Chemistry

Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8% carbon is __________

(Given : Molar mass of A = 84 g mol $^{-1}$ )

Correct Answer:

Molar mass of a hydrocarbon

(A)=84 \mathrm{~g} / \mathrm{mol}

Mass of carbon in

1 \mathrm{~mol}

(A)=\frac{85.8}{100} \times 84

=72 ~\mathrm{gm}

Mass of hydrogen in

1 \mathrm{~mol}

(A)=12 ~\mathrm{gm}

\therefore

Number of

\mathrm{H}

-atoms in a molecule of

(\mathrm{A})=12

Select an option to instantly check whether it is correct or wrong.

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