Consider the following statements: 1. Molecules of different ideal gases have the same translational kinetic energy at a given temperature. 2. The total translational kinetic energy for two moles of a

Question

Consider the following statements: 1. Molecules of different ideal gases have the same translational kinetic energy at a given temperature. 2. The total translational kinetic energy for two moles of an ideal gas is equal to 3RT. 3. At critical temperature, the intermolecular forces between gas molecules vanishes. 4. The gas with a larger value of the ratio of critical temperature to critical pressure will have larger value of excluded volume. Which of the following are correct?

Prashant Kotian · Accepted Answer

Correct answer: D. statement 1 is correct (k.e. per mole = 1.5 rt, independent of gas identity). statement 2 is correct (total k.e. for 2 moles = 2 × 1.5 rt = 3rt). statement 3 is incorrect (forces do not vanish, thermal energy just overcomes them). statement 4 is correct (since b = rtc/(8 pc), so larger tc/pc means larger b). hence, 1, 2 and 4 are correct.

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