Question

A pre-weighed vessel was filled with oxygen at $NTP$ and weighted. It was then evacuated, filled with $SO_{2}$ at the same temperature and pressure, and again weighted. The weight of oxygen will be

• A. The same as that of $SO_{2}$
• B. $\frac{1}{2}$ that of $SO_{2}$
• C. Twice that of $SO_{2}$
• D. One-fourth that of $SO_{2}$

Answer 1

Answer: (B)

$\frac{\text{M. wt. of $O_{2}$}}{\text{M. w t.of $SO_{2}$}}$
$\Rightarrow \frac{M_{1}}{M_{2}} \Rightarrow \frac{32}{34}=\frac{1}{2}$
The weight of oxygen will be $\frac{1}{2}$ that of $SO_{2}$