For the reaction
NH4Cl (s) → NH3 (g) + HCl (g)
ΔH ° = +176 kJ and ΔG ° = +91.2 kJ at 298 K. What is the value of ΔG at 1000 K?
a) -109 kJ
b) -64 kJ
c) +64 kJ
d) +109 kJ
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