Question

Density of ozone relative to oxygen under the same temperature and pressure is:

• A. $1$
• B. $2$
• C. $1.5$
• D. $2.5$

Answer 1

The correct option is C $1.5$

Under the same temperature and pressure, $1$ mole of ozone and $1$ mole of oxygen has the same volume.
$Density=\frac{Mass}{Volume}$
Thus, the density will be directly proportional to mass (as volume is constant).
The mass is proportional to molecular weight.
The mass of $1$ mole of ozone ($48$ g/mol) is $1.5$ times the mass of $1$ mole of oxygen ($32$ g/mol).
Hence, the density of ozone relative to oxygen is under the same temperature and pressure is $1.5$.