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17-1& 17-2 Review WS Describe the relationship between a compounds stability and its heat of formation value. 1. 2. Calculate the heat of formation for butane, CiHio. Make sure you balance the following equation first: CO2(g) What equation would you use to show the general relationship between the heat of a reaction and the heats of formation of the reactants and products? 3. 4. What equation would you use to determine how much energy is given off when a certain substance cools down? Assume that the mass, specific heat of the substance, and temperature change are given.

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1) Heat of formation is the am ount of energy involved for the formation of the compound/substance from its elements in their most stable state. Higher the the heat of formation value, higher the amount of heat need to be absorbed to form the compound and it makes the substance a high-energy compound. High energy compunds are reactive and are less stable. So Heat of formation and Compound's stability are inversely properotional.

High Heat of formation - Compound is less stable
Low Heat of formation - Compound is more stable

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