A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

When a 7.00-g sample of KCl is dissolved in water in a calorimeter that has a total heat capacity of 5.383 kJ·K–1, the temperature decreases by 0.300 K. Calculate the molar heat of solution of KCl.

  • This Question is Closed
  1. Photon336
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I think that this would have to be an endothermic reaction, because energy is absorbed. given by the fact hat the temperature decreases (tf < ti) meaning that heat was absorbed from the surroundings. \[7.0g KCl*(\frac{ mol }{ 75.0g }) = 0.09 mol, KCl\] \[q = mC \delta t \] not sure: \[\frac{ 5,383J }{ k (0.09) mol } = 57.9 kj*k ^{-1}mol ^{-1}\] q = 5.383jk*K^-1

  2. Photon336
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @Cuanchi

  3. Photon336
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @Rushwr C = specific heat, while q = heat capacity right? so all you need to do is put q/moles that's what I thought for this question.

  4. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    57.9 is wrong.

  5. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    122 is also wrong.

  6. Photon336
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @Cuanchi @Zale101

  7. Photon336
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    had a feeling something was wrong, whoever gets the right answer to this please tag me. I want to see how this is done. @aaronq

  8. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Nope, I've tried so many methods and all of them have been wrong so far haha. It should be in kj/mol.

  9. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    omg. it was as simple at (-.3)(5.383) = 1.61 then divide by (7g/74.5mol) = 17.2

  10. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    17.2 kj/mol is the answer!

  11. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Heat absorbed by calorimeter = (heat capacity of calorimeter)(Tf - Ti) then divide by moles to get into the correct units

  12. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thanks for all the help!

  13. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.