5 moles of oxygen is heated at a constant volume from 10C to 20C.What will be the change in internal energy of the gas?

Asked by aruni_maiyer | 8th Mar, 2011, 07:40: PM

Expert Answer:

Oxygen is a diatomic gas

number of degrees of freedom = n = 5

specific heat at constant volume = Cv = �R = �R 2 2

i.e, Cv = 2.5 x 8.31 = 20.78 J mor1 K"1

Heat supplied to raise the temperature of 5 moles of oxygen from 10�C to 20�C is d

= 5 x 20.78x 10 = 1039 J

Work done =dW = Q (v Volume is constant)

From the First law of thermodynamics, change in internal energy is dU = dQ - dW

= 1039-0 = 1039 J

Answered by  | 8th Mar, 2011, 10:00: PM

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