The standard reaction enthalpy for the decomposition of cacl2 · nh3(s) into cacl2(s) and nh3(g) is nearly constant at +78 kj mol−1 between 350.k and 470.k. the equilibrium pressure of nh3 in the presence of cacl2 · nh3 is 1.71 kp a at 400.k. find an expression for the temperature dependence of ∆rg◦ m in the same range.

Water vapor initially at 10 bar and 400 °c is contained within a piston-cylinder assembly. the water lost heat to the surrounding according to isochoric (iso-volumetric) process until its temperature is 150 °c. the water is then condensed isothermally to saturated liquid. for the water as a system, calculate the work in kj/kg