Kinetic Theory

A gas mixture consists of 8 moles of argon and 6 moles of oxygen at temperature T. Neglecting all vibrational modes, the total internal energy of the system is:

1. 29 RT
2. 27 RT
3. 20 RT
4. 21 RT

At which temperature is the r.m.s. velocity of a hydrogen molecule equal to that of an oxygen molecule at 47 ?

1. 20 K
2. 80 K
3. 4 K
4. -73 K

If three moles of monoatomic gas ( = 53 ) is mixed with two moles of a diatomic gas ( = 75 ), the value of adiabatic exponent for the mixture is

1. 1.35
2. 1.52
3. 1.40
4. 1.75

Two vessels A and B are of the same size and are at same temperature. A contains 1 g of hydrogen and B contains 1 g of oxygen. PA and PB are the pressures of the gases in A and B respectively, then PAPB is:

1. 4
2. 32
3. 8
4. 16

The temperature of a gas having 2.0 1025 molecules per cubic meter at 1.38 atm (Given, k=1.38 10-23 J K-1) is :

1. 500 K
2. 300 K
3. 200 K
4. 100 K

N moles of a polyatomic gas (f=6) must be mixed with two moles of a monoatomic gas so that the mixture behaves as a diatomic gas. The value of N is :

1. 6
2. 2
3. 4
4. 3

The average kinetic energy of a monatomic molecule is 0.414 eV at temperature : (Use KB = 1.38 10-23 J/K)

1. 3000 K
2. 3200 K
3. 1600 K
4. 1500 K

The total kinetic energy of 1 mole of oxygen at 27 is : [Use universal gas constant (R)=8.31 J/mole K]

1. 6232.5 J
2. 5670.5 J
3. 6845.5 J
4. 5942.0 J