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Q 1107180988.     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.` Find the enthalpy change in this process. `C_v` for argon is `12.49` `JK^-1 mol^-1`.
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