Synthetic natural gas (SNG), sometimes called substitute natural gas, is a methane containing mixture produced from the gasification of coal or oil shale directly at the site of the mine or oil field. One reaction for the production of SNG is: 4CO (g) + 8H2 (g) 3CH4 (g) + CO2 (g) + 2H2O g) Use the following thermochemical equations to determine H for the reaction as written. C (graphite) + 2H2 (g) CH4 (g) H = -74.8 kJ C (graphite) + ½ O2 (g) CO (g) H = -110.5 kJ CO (g) + ½ O2 (g) CO2 (g) H = -283.0 kJ H2 (g) + ½ O2 (g) H2O (g) H = -285.8 kJ