Question

The molar heat capacity at constant pressure for Nitrogen gas at STP is nearly 3.5 R. Now, when the temperature is increased, it gradually increases and approaches 4.5 R. The most appropriate reason for this behaviour is that at high temperatures

• A. nitrogen does not behave as an ideal gas
• B. nitrogen molecules dissociate in atoms
• C. the molecules collides more frequently
• D. molecular vibration gradually become effective

Answer 1

The correct option is D molecular vibration gradually become effective

The molar heat capacity at constant pressure for Nitrogen gas at STP is nearly 3.5 R. Now, when the temperature is increased, it gradually increases and approaches 4.5 R. The most appropriate reason for this behaviour is that at high temperatures molecular vibration gradually become effective.