What will be the change in internal energy of 128 g of oxygen gas at constant volume when it is heated from 30 oC to 45 oC ? The molar specific heat o oxygen at constant pressure is Cp = 7.03 cal.mol-1.oC-1 and R = 8.31 J.mol-1.oC-1  

[ Answer :  303 cal  ]

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Dear Student

mass of the oxygen m=128 gmNumber of moles n=128/32=4 moleCp = 7.03 cal.mol-1.oC-1 and R = 8.31 J.mol-1.oC-1R=8.31×0.2389=1.98 cal.mole-1oC-1Cp-Cv=RCv =7.03-1.98 =5.044Internal energy dU=nCvdTdU=4×5.044×15dU=303 cal

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303 cal
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