Q3/ One mole of an ideal gas, initially at 40°C and 1 bar, is changed to 120°C and 15 bar by three different mechanically reversible processes: (a)The gas is first heated at constant volume until its temp. Is 120°C . Then it is compressed isothermally until is pressure is 15 bar. (b) The gas is first heated at constant pressure until its temp. Is 120°C , then it is compressed isothermally to 15 bar. (c) The gas is first compressed isothermally to 15 bar; then it is heated t constant pressure to 120°C. Calculate Q, W,AH ‚Au in each case Take Cp=(;)R and Cv=R. 2

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