Calculate the standard enthalpy change for this reaction from these react of iro

Question

Calculate the standard enthalpy change for this reaction from these react of iron oxides with CO : (1) 3 Fe2O3 (s) + CO (g) right arrow 2 Fe3O4(s) + CO2 (g) Delta H degree = - 47 kJ (2) Fe2O3 (s) + 3 CO (g) right arrow 2 Fe (s) + 3 CO2 (g) delta H degree = -25 k (3) Fe3O4 (s) + CO (g) right arrow 3 FeO (s) + CO2 (g) delta H degree = 19 k 4. Using the following data, CH4 + 2 O2 right arrow CO2 + 2 H2O delta H degree = -890 kJ/mol H2O(I) right arrow H2 O(g) delta H degree = kJ/mol at 298 K Calculate the enthalpy of the methane combustion reaction.

Explanation / Answer

The enthalpy change given by the first equation is the enthalpy of combustion of methane. It is equal to -890 kJ/mol.

The enthalpy of the combustion is the enthalpy change for combustion of one mole of methane. In this combustion, water is obtained in liquid state. The second reaction which is the vapourization of water is not required.

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