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 ] NO LINKS PLEASE Share with your friends Share 2 Sandeep Kumar answered this 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 Regards 4 View Full Answer Lakshya Mahani answered this 303 cal -2