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Help Hess’s law

  1. Apr 23, 2007 #1
    what steps should I follow in order to hess questions like one like this one:

    Predict the heat of reaction when hydrochloric acid reacts with ammonia to form ammonium chloride.

    I am not really sure how to even start I am just overall confused with Hess’s law
    any help would be very much apperciated! :smile:
  2. jcsd
  3. Apr 24, 2007 #2
    You can find the heat of formation of NH4+, Cl-, HCl, and NH3, and then subtract the right of the equn from the left to get the solution.

    The principle here is that the energy on the right should be equal to the energy on the left. The gap that you will get should be the energy released, which is your heat of reaction.
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