We’re being asked to calculate ΔG° at 298 K for the given reactions:
We can use the following equation to solve for ΔG˚rxn:
The values for ΔG˚f can be looked up in textbooks or online:
Note that we need to multiply each ΔG˚f by the stoichiometric coefficient since ΔG˚f is in kJ/mol.
Calculate ΔG° at 298 K for the following reactions.
NH3(g) + HBr(g) → NH4Br(s)
2 KClO3(s) → 2 KCl(s) + 3 O2(g)
CH4(g) + 3 Cl2(g → CHCl3(g) + 3 HCl(g)
ΔG°f for CHCl3(g) is - 70.4 kJ/mol
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