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Molar specific heat of oxygen at constant pressure C_p=7.2 cal/mol/⁰C and R = 8.3 J/mol/K. At constant volume, 5 mol of oxygen is heated from 10°C to 20°C, the quantity of heat required is approximately:

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25 cal

50 cal

250 cal

500 cal

answer is C.

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Detailed Solution

By Mayer’s formula $C_{v} = C_{p} - R$

$= 7.2 - 2 \approx 5 c a l / m o l^{0} C$

At constant volume $∆ Q = μ c_{v} ∆ T = 5 \times 5 \times 10 = 250 c a l$

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