> Carbon doesn't really contain all that much hydrogen. The hydrogen also comes from water reacted (mildly endothermically) with carbon, and by further reactio

> Carbon doesn't really contain all that much hydrogen. The hydrogen also comes from water reacted (mildly endothermically) with carbon, and by further reaction of carbon monoxide with water. C + H2O --> CO + H2 CO + H2O --> CO2 + H2