Let Solution Individual reactions, as well as the energy change per reaction, ca

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Individual reactions, as well as the energy change per reaction, can be added together to obtain the final reaction you are looking for and the standard free energy change for that reaction. Writing out the formation reactions you get: Ba + C + 3/2O2 ---> BaCO3 -1139.0 kJ/mol Ba + 1/2S2 + 2O2 ---> BaSO4 -1353.0 kJ/mol C + O2 ---> CO2 -394.4 kJ/mol 1/2S2 + 3/2O2 ---> SO3 -370.0 kJ/mol Now you have to reverse reactions to get products on one side and reactants on one side. Reversing a reaction requires that you take the opposite of the free energy change, since the reaction is proceeding in the opposite direction: Ba + 1/2S2 + 2O2 ---> BaSO4 -1353.0 kJ/mol C + O2 ---> CO2 -394.4 kJ/mol BaCO3 ---> Ba + C + 3/2O2 (reversed) +1139.0 kJ/mol SO3 ---> 1/2S + 3/2O2 (reversed) +370.0 kJ/mol Adding the reactions together and canceling out products and reactions that are the same on both sides, you get: BaCO3(s) + SO3(g) ---> BaSO4(s) + CO2(g) -238.4 kJ (a) *The formation reactions might not be right, but basically write out the reactions, reverse or multiply what you need to to get it in the right order, remembering that whatever you do to the reaction, you must do to the free energy change, and add everything together.

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