Question

A gaseous mixture contains $C{O}_2\left(g\right)$ and $N_{2}O\left(g\right)$ in a $2:5$ ratio by mass. Find the ratio of the number of molecules of $C{O}_2\left(g\right)$ and $N_{2}O\left(g\right)$.

• A. $2:5$
• B. $5:2$
• C. $3:5$
• D. $5:3$

Answer 1

Answer: (A)

$2:5$

The molar mass of $C{O}_2$ and $N_{2}O$ are same i.e. $44$ g/mol.

Hence, the ratio of the number of molecules of $C{O}_2\left(g\right)$ and $N_{2}O\left(g\right)$ will be the same as the ratio of the masses

i.e. $2:5$.

Hence, option $A$ is correct.