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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.
3. Use the results of Steps 1 and 2 to determine the heat energy gained by the water (in J). Use the equation H = âtâ¢mâ¢Cp where H = heat absorbed (in J), ât = change in temperature (in Â°C), m = mass of the water heated (in g), and Cp = specific heat capacity (4.18 J/gÂ°C for water). 4. Calculate the mass (in g) of each food sample burned.