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Using the following data, calculate the standard enthalpy of reaction for the coal gasification process 2C(s) + 2H2O(g) --> CH4(g) + CO2(g).

C(s) + H2O(g) --> CO(g) + H2(g); ?H° = +131.3 kJ
CO(g) + H2O(g) --> CO2(g) + H2(g); ?H° = -41.2 kJ
CO(g) + 3H2(g) --> CH4(g) + H2O(g); ?H° = -206.1 kJ

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