Question

Which flask contains the largest number of molecules?

• A. Flask $A$
• B. Flask $B$
• C. Flask $C$
• D. All flasks contain the same number of molecules since they are at the same temperature and pressure

Answer 1

The correct option is D All flasks contain the same number of molecules since they are at the same temperature and pressure

Option $E$ is the correct answer.

At STP, 22.4 L of any gas contain Avogadro Number, $N_A$ of molecules.

Thus at STP, 1 L of any gas will contain $\frac{N_A}{22.4}$ number of molecules.

Thus, they all will contain same number of molecules as all their conditions are same, that is same temperature and pressure.