The standard reaction enthalpy for the docomposition of CaCl2.NH3(s) into CaCl2(s) and NH3(g) is nearly constant at +78kJmol-1 between 350 K and 470 K. The equilibrium pressure of NH3 in the presence of CaCl2.NH3 is 1.71kPa at 400K. Find an expression for the temperature dependence of change in Gibbs free energy in the same range
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