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  4. A compound contains 36 % C by mass. If each molecule contains two C atoms the number of moles of the compound in its 10 g is/are-

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Q. A compound contains $36 \% C$ by mass. If each molecule contains two $C$ atoms the number of moles of the compound in its $10 g$ is/are-

Some Basic Concepts of Chemistry

Solution:

Let molar mass of compound $= y \,g$

$\%$ by wt of $C =36$

So,

$\frac{24}{y} \times 100=36$

$\frac{2400}{36}=y$

$y=66.6 \,g$

So $, 66.6 g$ has moles $=1$

$10 g$ has moles $=\frac{1}{66.6} \times 10=0.15$