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Question

70 cal heat is required to raise the temperature of 2 moles of an ideal gas at constant pressure from 25oC to 30oC , then the amount of heat required to raise the temperature of same gas through same raise of temp. at constant volume is

A
50cal
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B
70cal
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C
90cal
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D
60cal
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Solution

The correct option is A 50cal
For isobaric process, ΔQ=nCpΔT
Putting values, we get Cp=7cal/molK

Also, Cv=CpR
Cv=(72)cal/molK
Hence for isochoric poocess,
ΔQ=nCvΔT
Putting values, we getΔQ=50 cal

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