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Statement 1: When He gas and H2 gas are in thermal equilibrium with each other, both have equal average translational kinetic energy. Statement 2: The molar heat capacity of CO2 is higher at higher temperatures.

1. Both statements are true.
2. statement - 1 is true and statement - 2 is false
3. statement - 2 is true and statement - 1 is false
4. Both statements are false

Correct answer: Both statements are true.

Solution

Statement 1 is true: at thermal equilibrium, all gases share the same temperature T, and average translational KE = (3/2)kT independent of molecular structure. Statement 2 is true: CO2 has vibrational modes that become active at higher temperatures, increasing molar heat capacity with temperature.

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