Question

Equal volume of $H_2,O_2$ and he gases are at temperature and pressure .Which of these with large number of molecules:

• A. $H_2$
• B. $O_2$
• C. $He$
• D. All the gasses will have same number of molecules

Answer 1

The correct option is D All the gasses will have same number of molecules

From the ideal gas equation, $PV=nRT$ where the number of moles is given as $n=\frac{PV}{RT}$

We see that under similar physical conditions the value of $n$ is same so we number of molecules will also be $same.$

Because number of molecules=$n\times N_a$ where $N_a$ is Avogadro's number.

Option D is correct.