Question

Which of the following gases will have a density of $1.8{\text{g L}}^{-1}$ at 760 torr pressure and ${27}^{\circ }\text{C}$?

• A. $O_2$
• B. $C{O}_2$
• C. $N{H}_3$
• D. $S{O}_2$

Answer 1

The correct option is B $C{O}_2$

Given:
Density, $d=1.8{\text{g L}}^{-1}$
Pressure of the gas, $P=760\text{torr}=1\text{atm}$
$T={27}^{\circ }\text{C}=300K$
$PM=dRT$
$M=\frac{dRT}{P}=\frac{1.8\times 0.0821\times 300}{1}=44\text{g}$
$\therefore$ The gas will be $C{O}_2$.