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So O2 has zero of heat of formation (or enthalpy of formation). The enthalpy of a reaction is defined like this: H = Hproducts-H reactants. The enthalpy of reaction in this case, is the same as the heat of combustion. Hproducts is obtained summing the heats of formation.
The combustion of methanol is shown by the following equation: i. Given the data which follows: a. Find the heat of reaction for the equation above. b. State the molar heat of combustion of methanol. c. State whether the reaction is endothermic or exothermic. ii. What mass of water could be heated from 20.0 deg.