First Law, Work & Enthalpy

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1.
For an ideal gas expanding against zero external pressure (free expansion), which is true?
2.
Work done during reversible isothermal expansion of 2 mol of an ideal gas from 10 L to 40 L at 300 K is approximately:
3.
For an ideal gas at constant temperature, which relationship is correct?
4.
One mole of an ideal gas (Cv = 3R/2) is heated from 300 K to 500 K at constant volume. The change in internal energy is:
5.
The internal energy of an ideal gas depends on:

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