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Pretty much. You can add (or subtract) equations together to get the desired reaction that you need the enthalpy for. Once you have decided what needs to be added or subtracted you use their enthalpies, making sure the signs match if that equation is endo- or exothermic.
Yes, make sure that all states of matter can cancel out and then manipulate each equation (multiplying or flipping) so that you get the final equation. Add together the enthalpies to find the enthalpy of the reaction.
Yes that is the basics. The two strategies are to either flip the equations or multiply them by whole numbers. If you do decide to flip the equation you must make sure that you change the sign of the enthalpy. (I believe that is how you spell it)
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