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Homework Help: Thermodynamics problem?

  1. May 1, 2009 #1
    How do i solve this chem, thermodynamics problem?
    find ΔHf for OH(g) if

    H2O2 (g)--> 2OH(g)


    what is ΔH(diss)?? what is 'diss'

    someone told me The ΔH(diss)=213KJ/mol is equal to twice the ΔHf of OH. but i doont know how they got to this, also it seems a bit too simple for a qestion if all i need to do is divide by 2,
    so how would i solve this?
  2. jcsd
  3. May 1, 2009 #2
    Your [tex]\Delta H(diss)[/tex] is your enthalpy of reaction. Remember that the enthalpy of reaction equals: Enthalpy of formation of products - Enthalpy of formation of reactants. Replace your data (you will need to look for H2O2 enthalpy of formation on a table) there and solve for [tex]\Delta H(OH)[/tex].
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