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Internal Energy Change

  1. Mar 21, 2015 #1
    1. The problem statement, all variables and given/known data
    Internal Energy Change

    2. Relevant equations
    N/A

    3. The attempt at a solution
    If internal energy change equals enthalpy change, then I am looking for the reaction which has the enthalpy change closest to zero. I know it cannot be A, as the formation of water is highly exothermic. I know it cannot be C, as the vaporization of water is highly endothermic. This leaves B and D. I think it should be D, as it is a decomposition. I find that the breaking of bonds of halogens in B to seem endothermic.
     
  2. jcsd
  3. Mar 21, 2015 #2
    Which reaction has the smallest volume change if carried out at constant temperature and pressure?
     
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