Question

If the density of a gas $A$ is $1.5$ times that of $B$ then the molecular mass of $A$ is $M$. The molecular mass of $B$ will be :

• A. $1.5M$
• B. $\frac{M}{1.5}$
• C. $3M$
• D. $\frac{M}{3}$

Answer 1

Answer: (B)

$\frac{M}{1.5}$

If the density of a gas $A$ is $1.5$ times that of $B$ then the
maolcular mass of $A$ is $M$. The molecular mass of $B$ will be $\frac{M}{1.5}$.
$d\propto M$
$\frac{d_A}{d_B}=\frac{M_A}{M_B}$
$1.5=\frac{M}{M_B}$
$M_B=\frac{M}{1.5}$