Question

The mass of $2.8$ litres of $C{O}_2$ is:
$[C=12,O=16]$

• A. 55 g
• B. 5.5 g
• C. 5 g
• D. 2 g

Answer 1

The correct option is B 5.5 g

Let us consider the problem:

Mass of 1 mole $C{O}_2=44gm$

$1$ mole $=22.4L$

therefore,mass of $22.4L=44gm$

Mass of $2.8L=\frac{2.8}{22.4}\times 44=\frac{44}{8}$

$=5.5g$