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What is the change in internal energy when 10 kg mol of Oxygen is heated from 200 K to 400 K at constant volume (Cv = 4000 J/(Degree Celsius)(Kg.mole))?

(a) 2 MJ

(b) 4 MJ

(c) 6 MJ

(d) 8 MJ

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Correct choice is (d) 8 MJ

The explanation: U2 – U1  = n*Cv*(T2-T1).

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