For the isothermal expansion of an ideal gas: (a) \( \mathrm{U} \) and \( \mathrm{H} \) increase...

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For the isothermal expansion of an ideal gas:
(a) \( \mathrm{U} \) and \( \mathrm{H} \) increases.
(b) \( \mathrm{U} \) increases but \( \mathrm{H} \) decreases.
(c) \( \mathrm{H} \) increases but \( \mathrm{U} \) decreases.
(d) \( \mathrm{U} \) and \( \mathrm{H} \) are unaltered.
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