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!

Chemistry = looking up numbers then adding/subtracting them

  1. Jan 21, 2013 #1
    1. The problem statement, all variables and given/known data

    Attached

    2. Relevant equations

    Heat of reaction = Heat of formation of all products - heat of formation of all reactants

    3. The attempt at a solution

    1.) It's 0 kJ/mol because it is.

    2.) Every source agrees with 143 kJ/mol or 142.7 kJ/mol (which I've tried).

    3.)

    H = -641.8 - (2(-167.4)-462.0)
    = 155 kJ/mol

    4.)

    H = 2(-397.7) - 2(-432.8) - 0
    = 70.2 kJ/mol

    The numbers I have for these heats of formation are:

    Mg2+: -462.0
    Cl-: -167.4
    MgCl2: -641.8
    KClO3: -397.7
    KClO4: -432.8
     

    Attached Files:

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

Can you offer guidance or do you also need help?



Similar Discussions: Chemistry = looking up numbers then adding/subtracting them
  1. Chemistry Experiments (Replies: 0)

  2. Coordination Chemistry (Replies: 0)

  3. Physical Chemistry (Replies: 0)

  4. Analytical Chemistry (Replies: 0)

Loading...