Heat is added to 1 mol of an ideal monatomic gas confined to a cylinder with a movable piston at one end. The gas expands quasi-statically at a constant temperature of 400 K until its volume increases from 2 liters (L) to 8 L. (a) What is the change in its internal energy? (b) How much work does the gas do? (c) How much heat is added to the gas?

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