Question

Which of the following contains maximum number of molecules?

• A. 1 gm of $C{O}_2$
• B. 1 gm of $N_2$
• C. 1 gm of $H_2$
• D. 1 gm of $C{H}_4$

Answer 1

The correct option is C 1 gm of $H_2$

The mass is same for all the four gases.
The gas having lowest molar mass will have maximum number of moles and maximum number of molecules.
The molar masses of $C{O}_2,N_2,H_{2}andC{H}_4$ are 44 g/mol, 28 g/mol , 2 g/mol and 16 g/mol respectively.
Thus, the molar mass of hydrogen is minimum.
Thus, 1 g of $H_2$ will have maximum number of molecules.