Chemistry

Problem

At 298 K the following enthalpy changes are reported: (1) C(graphite) + O2(g) → CO2(g) ΔH = –394 kJ (2) H2(g) + 1/2 O2(g) → H2O(l) ΔH = –286 kJ (3) CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) ΔH = –891 kJ Calculate the enthalpy change, in kJ, for the reaction C(graphite) + 2 H2(g) → CH4(g).

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