NH3(g)   +  HCl(g)   ---->   NH4Cl(s) ΔHfo(kJ/mol):  -46.2          -92.3                   -314.4 So (J/K-mol):    192.5          186.7                    94.6 At what temperature, in °C, will the reaction above become non-spontaneous? 618 °C 1230 °C 345 °C reaction is spontaneous at all temps. 433 °C

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