Question

A compound contains $36$ % carbon by mass. If each molecules contains two carbon atoms the number of moles of its $10$ g is ____________.

• A. $66.67$
• B. $0.15$
• C. $0.30$
• D. $1.5$

Answer 1

Answer: (B)

$0.15$

$36$% carbon i.e

$100gram$ of the compound $\equiv 36gram$ of carbon

From the given data we know that,

1 mole of the compound contains 2 moles of Carbon.

36 gm of carbon = $\frac{36}{12}=3$ mole

3 mole of carbon is present in $\frac{1}{2}\times 3=\frac{3}{2}$ moles of the compound.

$\frac{3}{2}$ mole $=\frac{100g}{M.W.ofcompound}$

M.W. $=66.67$

Moles of compound $=\frac{w}{M.W.}=\frac{10}{66.67}=0.15mole$

Option B is correct.