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Meghana Kumer
Asked: 2022-11-10T03:15:07+05:30 In:

A gas `(C_(v.m) = (5)/(2)R)` behaving ideally is allowed to expand reversibly and adiabatically from `1` litre to `32` litre. Its initial temperature is `327^(@)C`. The molar enthalpy change (in `J//mol`) for the process is :
A. `-1125 R`
B. `-675`
C. `-1575 R`
D. 101 R

A gas `(C_(v.m) = (5)/(2)R)` behaving ideally is allowed to expand reversibly and adiabatically from `1` litre to `32` litre. Its initial temperature is `327^(@)C`. The molar enthalpy change (in `J//mol`) for the process is :
A. `-1125 R`
B. `-675`
C. `-1575 R`
D. 101 R
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  1. Correct Answer – C
    `(T_(2))/(T_(1)) = ((V_(1))/(V_(2)))^(gamma-1), T_(2) = T_(1)((1)/(32))^((7)/(5)-1) = 600((1)/(2^(5)))^(2//5)`
    `= 600(0.5)^(2)=150K, Delta H_(m) = (7)/(2)R xx(150-600) = -1575 R`

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Subhash Lalit Pathak
Asked: 2022-10-30T19:47:58+05:30 In:

A gas `(C_(v.m) = (5)/(2)R)` behaving ideally is allowed to expand reversibly and adiabatically from `1` litre to `32` litre. Its initial temperature is `327^(@)C`. The molar enthalpy change (in `J//mol`) for the process is :
A. `-1125R`
B. `-675`
C. `-1575R`
D. None of these

A gas `(C_(v.m) = (5)/(2)R)` behaving ideally is allowed to expand reversibly and adiabatically from `1` litre to `32` litre. Its initial temperature is `327^(@)C`. The molar enthalpy change (in `J//mol`) for the process is :
A. `-1125R`
B. `-675`
C. `-1575R`
D. None of these
Parabola
Leave an answer

Leave an answer

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1 Answer

  1. Correct Answer – C
    `(T_(2))/(T_(1))=((V_(1))/(V_(2)))^(gamma-1)`
    `T_(2)=T_(1).((1)/(32))^((7)/(5)-1)=600.((1)/(2^(5)))^((2)/(5))`
    `=600(0.5)^(2)=150K`
    `DeltaH_(m)=(7)/(2)Rxx(150-600)=-1575R`

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