The molar specific heat of oxygen at constant pressure is C p = 7.03 c a l mol - 1 K - 1 and R = 8.31 J mol -1 K -1 . The amount of heat taken by 5 moles of oxygen, when heated at constant volume from 10 ° C to 20 ° C, will be approximately

Question

The molar specific heat of oxygen at constant pressure is C p = 7.03 c a l mol - 1 K - 1 and R = 8.31 J mol -1 K -1 . The amount of heat taken by 5 moles of oxygen, when heated at constant volume from 10 ° C to 20 ° C, will be approximately, 25 c a l, 50 c a l, 253 c a l, 500 c a l

MARKS App · Accepted Answer

Given, C p = 7.03 c a l m o l - 1 K - 1 , R = 8.315 J m o l - 1 K - 1 n = 5 moles , T 2 = 20 o C , T 1 = 10 o C , ∆ Q = ? ∴ Heat, ∆ Q = n C V ∆ T = n C p - R ∆ T ∵ C p - C v = R = 5 7.03 - 8.31 4.2 × 20 - 10 ≃ 253 c a l

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