The standard enthalpy change of the reaction can be calculated by using the formula:
ΔHcӨ(reaction) = ΣΔHcӨ(products) - ΣΔHcӨ(reactants)
ΔHcӨ(reaction) = [-890 kJ/mol] - [(1 x -394 kJ/mol) + (2 x -286 kJ/mol)]
ΔHcӨ(reaction) = -890 kJ/mol + 676 kJ/mol
ΔHcӨ(reaction) = -214 kJ/mol
Therefore, the standard enthalpy change of the reaction C(s) + 2H2(g) ⇢ CH4(g) is -214 kJ/mol.
The table below shows some values for standard enthalpy changes of combustion. Use these values in the table below to calculate the standard enthalpy change of the reaction
C (s) + 2H2 (g) ⇢CH4 (g)
Substance
incrementHc Ө / kJ/mol
C (s)
-394
H2 (g)
-286
CH4 (g)
-890
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