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Question

Given the following data: 2H2(g) + C(s) → CH4(g) ΔG° = -51 kJ 2H2(g) + O2(g) → 2H2(l) ΔG° = -474 kJ C(s) + O2(g) → CO(g) ΔG° = -394 kJ Calculate ΔG° for CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)