1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Enthalpy and heat change

  1. Jan 23, 2007 #1
    You people heard about hess law means that sum of all enthalpies of chemical reactions takes place but why we only call sum of all enthalpies?

    A----B dH1
    B----C dH2 HESS LAW
    DH = dH1 + dH2

    A----B dQ1
    B----C dQ2 ?
    DQ = dQ1 + dQ2
    In the above representations one is associated with enthapy and another is heat
    whethe second one is valid or not?if so why?
  2. jcsd
  3. Jan 23, 2007 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Welcome to the forums syamdcs,

    According to the rules of the forum, you must show your work/attempt before we can offer any assistance. Also, in future, could you please post homework questions in the appropriate forum. Thanks.
  4. Jan 27, 2007 #3
    please i will like u to give me some major diferences btw thermodynamic and kinetic stability
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Enthalpy and heat change
  1. Enthalpy Change (Replies: 9)

  2. Enthalpy changes (Replies: 1)

  3. Enthalpy change? (Replies: 5)