    Question

# Five moles of an ideal gas at 300K, expanded isothermally from an initial pressure of 4atm to a final pressure of 1 atm against a cont. external the pressure of 1atm. Calculate q,w, ΔU & ΔH. Calculate the corresponding value of all if the above process is carried out reversibly

A
wirr=9356.25J,wrev=17291.6J,ΔU=ΔH=0
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B
wirr=9356.25J,wrev=17291.6J,ΔU=ΔH=0
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C
wirr=9356.25J,wrev=17291.6J,ΔU=ΔH=0
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D
None of these
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Solution

## The correct option is B wirr=9356.25J,wrev=17291.6J,ΔU=ΔH=0Wirr=−nRT(1−P2P1)=−5×8.314×300(1−14)Wirr=−9.353kJWrev=−2.303nRTlog(V2V1)Wrev=2.303×5×8.314×300log4Wrev=17.29kJand Δq=ΔEWat ΔT→0ΔE→0ΔH→0Wrev=q=17.29kJ  Suggest Corrections  0      Similar questions  Related Videos   How to Expand?
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