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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.
Calculate the amount of heat energy required to condense steam at 100 C,cool liquid and freeze it at 0 C. Share this answer and help others! When 1g of steam at 100 ÂºC condenses to give 1 g of water at 100 ÂºC, 2260 J of heat will be released to the surroundings. So find the heat released when 95g of steam changes. Specific heat of water = 4.18 J/gÂ° C. So multiply 4.18 by 95 (for mass of water) and by 100 (for temp change) Heat of fusion of water = 334.0 J/g (check this data). You have 95g so multiply it by 95. Add the three steps together to get total energy released.