Question

The mass of $5.6$ litres of $O_2$ at STP is:

• A. $\frac{5.6}{22.4}$
• B. $\frac{8}{5.6}$
• C. $\frac{22.4}{5.6}\times 32$
• D. $\frac{5.6}{22.4}\times 32$

Answer 1

Answer: (D)

$\frac{5.6}{22.4}\times 32$

At STP, $22.4$ L of oxygen corresponds to $1$ mol.

Thus, $5.6$ L of oxygen will correspond to $\frac{5.6}{22.4}\times 1=0.25$ mol.

$V=\frac{mass}{MW}\times 22.4$

Hence, Mass $=\frac{5.6}{22.4}\times 32$