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Enthalpy Question

  1. Jun 7, 2014 #1
    1. The problem statement, all variables and given/known data

    H2 (g) + Cl2 (g) --> 2 HCl (g) + 184.62 kJ

    Four statements about energy changes in reactions are listed below:

    1. The enthalpy of the reactants is greater than the enthalpy of the products.
    2. The enthalpy of the reactants is less than the enthalpy of the products.
    3. The change in enthalpy of this reaction is positive.
    4. The change in enthalpy of this reaction is negative.

    Which two statements are true for this reaction?

    2.The attempt at a solution

    The delta H is -186.62 kJ; therefore the enthalpy of the products must be greater than the enthalpy of the reactants. I chose statement 2 & 4.

    The answer key states that statements 1 & 4 are correct.
     
  2. jcsd
  3. Jun 8, 2014 #2
    ΔH=Hproducts-Hreactants=-184.62 kJ

    Chet
     
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