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)`.

Explanation

T_1 = 300 K, cal `T_2 ` using `T_2/T_1 = (V_1/V_2)^(R//C_V)`
`Delta H = nC_p (T_2 - T_1) = n (C_v + R) (T_2 - T_1) `
-117.6 J