Question:
A perfect gas expands reversibly at a constant temperature of 298 K so that its volume doubles. What is the change in the molar internal energy of the gas?
A perfect gas expands reversibly at a constant temperature of 298 K so that its volume doubles. What is the change in the molar internal energy of the gas?
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Internal energy of an ideal gas depends only on temperature (Joule's law).
Updated On: Jul 3, 2026
- +2.27 kJ/mol
- 0 J/mol
- +1.72 kJ/mol
- -2.27 kJ/mol
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The Correct Option is B
Solution and Explanation
Step 1: For an ideal gas, U depends only on T (Joule's law).
Step 2: This is isothermal, T constant.
Step 3: delta T = 0, so delta U = 0.
\[\boxed{\Delta U = 0\ J/mol}\]Was this answer helpful?
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