When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released. For this reason, it is often used as a fuel in high performance racing cars. The combustion of methanol has the balanced, thermochemical equation CH3OH(g)+32O2(g)CO2(g)+2H2O(l)=764 kJ How much methanol, in grams, must be burned to produce 645 kJ of heat?