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Q.

Molar specific heat of oxygen at constant pressure Cp= 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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a

500 cal

b

50 cal

c

250 cal

d

25 cal

answer is C.

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Detailed Solution

By Mayer’s formula Cv=Cp-R

=7.2-2≈5 cal/mol0C

At constant volume ∆Q=μcv∆T=5×5×10=250 cal

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