Heat energy of 743J is needed to raise the temperature of 5 moles of an ideal gas by 2K at constant pressure. How much heat energy is needed to raise the temperature of the same mass of the gas by 2K at constant volume?
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Solution
At constant pressure, Q1=nCPΔT=743J At consatnt volume, Q2=nCvΔT=n(cp−R)dT =743−5×8.3×2 =660J