Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u. Molecular mass of B will be

The pressure exerted by 6.0 g of methane gas in a 0.03 m³ vessel at 129^oC is (Atomic masses : C = 12.01, H = 1.01 and R = 8.314 J K^$$-$$1 mol^$$-$$1 )

The energy absorbed by each molecule (A₂) of a substance is 4.4 $$ \times $$ 10^$$-$$19 J and bond energy per molecule is 4.0 $$ \times $$ 10^$$-$$19 J. The kinetic energy of the molecule per atom will be

If a gas expands at constant temperature, it indicates that