Question

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

• A. 0.15
• B. 1.5
• C. 150
• D. 1500

Answer 1

Answer: (A)

Let molar mass of compound $=yg$

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

So,

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

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

$y=66.6g$

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

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