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The standard reaction enthalpy for the decomposition of CaCl2_NH3 into CaCl2 and NH3 is nearly constant at +78 kJ/mol between 350 K and 470 K. The equilibrium pressure of NH3 in the presence of CaCl2-NH3 is 1.71 kPa at 400 K. Find an expression for the temperature dependence of Delta G of reaction in the same range.

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