The temperature of 5 moles of a gas at constant volume is changed from 100 ° C to 120 ° C . The change in internal energy is 80 J . The total heat capacity of the gas at constant volume (in J K - 1 ) is

Question

The temperature of 5 moles of a gas at constant volume is changed from 100 ° C to 120 ° C . The change in internal energy is 80 J . The total heat capacity of the gas at constant volume (in J K - 1 ) is, 8, 4, 0.8, 0.4

MARKS App · Accepted Answer

Number of moles n = 5 mol , T 1 = 100 ° C T 2 = 120 ° C , ∆ U = 80 J Rise in temperature ∆ T = 120 - 100 = 20 ° C ∆ U = ms ∆ T 80 5 = 1 × s × 20 s = 0.8 J ∴ For 5 mol, s = 0.8 × 5 J K - 1 = 4 J K - 1

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