1. Limited time only! Sign up for a free 30min personal 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!

Determine ΔS when mixing

  1. Dec 11, 2011 #1
    1. The problem statement, all variables and given/known data

    For both H20 and D20:
    Cp = 75.5 J/mole-k for the liquid Cp = 37.8 J/mole-k for the solid ΔHfus=6.01 kJ/mole.

    Liquid H20 and D20 form an ideal solution.

    a) One mole of liquid H20 at 10 C is mixed with four moles of LIQUID D20 at 0 C in an insulated container.
    Determine ΔS.

    b) One mole of liquid H20 at 10 C is mixed with four moles of SOLID D20 at 0 C in an insulated container.
    Determine ΔS.


    2. Relevant equations

    ΔSmixing = -R(nX1lnX1 + nX2lnX2)

    3. The attempt at a solution

    I found
    ΔSmixing = -R(nX1lnX1 + nX2lnX2) = -8.324[(1mol)(1/5)ln(1/5) + (4mol)(4/5)ln(4/5)] = 8.612 j/mol-k

    I don't really understand the question. Can someone explain some of he concepts I need to know or direct me to somewhere where it sums it up?

    What are the steps to solving this? What do I have to think about? (Like...I know X, so I get Y because of Z)
     
  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?
Draft saved Draft deleted