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5 moles of and ideal gas at 100 K are allowed to undergo reversible compresion till its temperature becomes 200 K. If C V = 28J K –1 mol –1 , calculate Δ U and Δ pV

1. Δ U = 14J; Δ (pV) = 0.8J
2. Δ U = 14kJ; Δ (pV) = 4kJ
3. Δ U = 14kJ; Δ (pV) = 18J
4. Δ U = 2.8 kJ; Δ (pV) = 0.8kJ

Correct answer: Δ U = 14kJ; Δ (pV) = 4kJ

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