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Question

The specific heat of hydrogen gas at constant pressure is CP=3.4×103cal/kgC and at constant volume is Cr=2.4×103 cal/kgC If one kilogram hydrogen gas is heated from 10  to 20 at constant pressure, the external work done on the gas to maintain it at constant pressure is 


A
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B
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C
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D
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Solution

The correct option is B

From FLOT Q=U+W
Work done at constant pressure (W)P=(Q)PU
(Q)(QV)         ( As we know (Q)V=U)
Also (Q)P=mcpT and (Q)V=mcVT
(W)p=m(CPCV)T
(W)P=1×(3.4×1032.4×103)×10=104cal


Physics

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