edexcel gce chemistry april 2014 unit 3b
for approaching them. Example 1: Enthalpy Calculations Question: Calculate the standard enthalpy change of formation of methane, CH₄, given the following data: Combustion of methane: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) ΔH = -890 kJ Combustion of carbon: C(s) + O₂(g) → CO₂(g) ΔH =