4. From the following data, C(graphite) + O,(g) → CO,(g) AH = -393.5 kJ/mol H;O(l) AH = -285.8 kJ/mol 4CO,(g) + 6H,0() AH = -3119.6 kJ/mol H2(g) + 0:(8) %3D 2C,H,(g) + 702(8) calculate the enthalpy change for the reaction 2C(graphite) + 3H2(g) → C,H,(g)

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