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I agree that it will depend on the question and what we've covered in class. I feel like for the most part we would be given the reactions we need and the one we are looking for however there was a homework problem where we needed to know the combustion equations.
Yeah, seems like we often don't have to memorize a lot of things just for the sake of memorizing them. Instead, we're given pieces and necessary info: the enthalpies and reactions to reach the final reaction and get its enthalpy and that demonstrates our understanding.
I think either type of question can be asked. He can either give us the equation, or lets say there is a problem on the change in enthalpy of combustion, we would be expected to know how to write and balance the equations of combustion that correspond to the enthalpy of combustion data we are given.
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