Methane reacts with steam to produce carbon monoxide and hydrogen. The equation for this process is given below.CH4(g) + H2O(g) → CO(g) + 3H2(g)The table below shows the standard enthalpy changes of formation for CH4, H2O and CO.
| compound | ΔHfθ/kJ mol–1 |
| CH4(g) | -75 |
| H2O(g) | -242 |
| CO | -110 |