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A sample of argon gas at 1atm pressure a...

A sample of argon gas at `1atm` pressure and `27^(@)C` expands reversibly and adiabatically from `1.25 dm^(3)` to `2.50 dm^(3)`. Calculate the enthalpy change in this process. `C_(vm)` for orgon is `12.48J K^(-1) mol^(-1)`.

Text Solution

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`-116.4` J
`DeltaH = nC_(p) DeltaT`
`T_(1)V_(1)^(gamma-1) = T_(2)V_(2)^(gamma-1) rArr gamma = C_(p)/C_(p)`
`C_(p) = (5R)/2, C_(v) = (3R)/2`, for He Ar
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