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Question

The molar specific heat of oxygen at constant pressure Cp= 7.03 cal/moloC and R = 8.31 J/moloC. the amount of heat taken by 5 mol of oxygen when heated at constant volume from 10oC to 20oC will be approximately

A
25cal
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B
50cal
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C
250cal
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D
500cal
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Solution

The correct option is C 250cal
Molar heat capacity at constant volume,Cv=CpR
=5cal/molK
No. of moles=n=5,
change in temperature=ΔT=10K
Amount of heat absorbed=ΔQ=nCvΔT
=(5×5×10)cal
=250cal

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