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

A sample of argon gas at 1 atm 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 argon is `12.48 JK^(-1) mol^(-1)`.

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The correct Answer is:
`-114.53` Joules
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