Question

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

• A. $5:2$
  
• B. $2:5$
• C. $1:2$
• D. $5:4$

Answer 1

The correct option is B $2:5$

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

The molecular weights of both the molecules are same $=44$ g/moles.

$\therefore$ the ratio of the number of molecules would also be $2:5$ i.e. similar to their mole ratio.