Question

Calculate the volume occupied by $5.0$ $g$ of acetylene gas at ${50}^{o}C$ and $740$ $mm$ of pressure.

• A. $5.237$ $L$
• B. $5.5$ $L$
• C. $4.5$ $L$
• D. None of these

Answer 1

The correct option is A $5.237$ $L$

The ideal gas equation is:
$PV=nRT=\frac{W}{Mw}RT$
or, $V=\frac{1}{P}\frac{W}{Mw}RT$ ($Mw$ of $C_2{H}_5$ is $26$ $g$)
$V=\frac{760}{740}\times \frac{5}{26}\times 0.0821\times 323=5.237L$