3 moles of an ideal monoatomic gas is heated at constant pressure of one atmosphere from 0∘C to 70∘C. Then, work done by the gas is
A
1.74 kJ
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B
0.5 kJ
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C
6.98 kJ
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D
11.3 kJ
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Solution
The correct option is A 1.74 kJ For monoatomic gas, degrees of freedom is 3 Thus, Cv=32R and Cp=52R R=8.31J/mol−K dQ=dU+W dQ=nCpdT=3×52×8.31×(70−0) dQ=4362.75J dU=nCvdT=3×32×8.31×(70−0) dU=2617.65J W=4362.75−2617.65=1745.1J W=1.74KJ