Calculate the heat of formation for aspirin given the standard enthalpies of for

Question

Calculate the heat of formation for aspirin given the standard enthalpies of formation for CO2, H2O, and O2 are -393.5 kJ/mol, -285.83 kJ/mol, and 0 kJ/mol, respectively.

Explanation / Answer

Aspirin = acetylsalicylic acid = C9H8O4 Combustion is the reaction of a substance with oxygen, and usually produces CO2 and H2O. So... > Write a balanced chemical equation for the combustion of aspirin C9H8O4 + 9 O2 -> 9 CO2 + 4 H2O Heat of formation is the amount of energy it would take to put all the pieces together, so if you find the energy released by the parts and add them up, you get the energy required to make the original substance in the first place. (If you know how much energy the rock released when it fell down the hill, you also know how much energy it would take to push it back up because energy is neither created nor destroyed.) > Calculate the heat of formation for aspirin 9 mol CO2 * (393.5 kJ/mol) + 4 mol H2O * (285.83 kJ/mol) - 4 mol O2 * (0 kJ/mol) = 4.684 kJ/mol

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