Question

$I$. The density of helium gas is $1/8$ the density of oxygen gas.
$II$. The average atomic mass of helium is $4.00$ and the average atomic mass of oxygen is $16.00$

• A. Statement $I$ is true, Statement $II$ is true
• B. Statement $I$ is true, Statement $II$ is false
• C. Statement $I$ is false, Statement $II$ is true
• D. Statement $I$ is false, Statement $II$ is false

Answer 1

The correct option is A Statement $I$ is true, Statement $II$ is true

Helium is monoatomic gas,

$\therefore$ density $=\frac{mass}{volume}=\frac{4}{volume}$

Oxygen is diatomic gas,

$\therefore$ density $=\frac{mass}{volume}=\frac{32}{volume}$

Hence density of $He=\frac{1}{8}th$ of oxygen.