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!

Thermochemistry relating delta H and q of surroundings

  1. Nov 23, 2014 #1
    1. The problem statement, all variables and given/known data
    Why does ##\Delta H=\pm |q_{surroundings}|##?

    2. Relevant equations


    3. The attempt at a solution
    Exothermic reactions have a ##-\Delta H## but does that mean that ##q## is a ##+q##. Vice versa for a endothermic reaction. I get confused on which sign i should use for which when i do my thermochemistry questions.
     
  2. jcsd
  3. Nov 23, 2014 #2
    For an exothermic reaction at constant temperature and pressure, ΔH = q, and both are negative. For an endothermic reaction at constant temperature and pressure, ΔH = q, and both are positive.

    Chet
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Thermochemistry relating delta H and q of surroundings
Loading...