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!

What is BaCl2 * 5H2O

  1. Jul 31, 2003 #1
    Chemistry help plz!!

    I've tried to work out the problem below, but I got weird answer, it's not even in one of the choices. Please help me solve this problem and show me out u got it. Thank you.
    A sample of a hydrate of BaCl2 with a mass of 61 grams was heated until all the water was removed. The sample was then weighed and found to have a mass of 52 grams. What is the formula for the hydrate?
    (A) BaCl2 * 5H2O
    (B) BaCl2 * 4H2O
    (C) BaCl2 * 3H2O
    (D) BaCl2 * 2H2O
    (E) BaCl2 * H2O
     
  2. jcsd
  3. Aug 1, 2003 #2

    Ivan Seeking

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Re: Chemistry help plz!!

    Starting with your equation: BaCl2 + MH2O

    Then, N x grams per mole of (BaCl2 + MH2O) = 61 grams

    N is the number of moles of the hydrate.

    Where we must determine the coefficient M.

    You know that you have removed 9 grams of water:

    M x (N moles of H2O at [(2 X 1.008) + 15.99]grams/mol) = 9 grams

    Solve for N,
    N moles of BaCl2 at [137.34 + (2 X 35.45)] = 52 grams.

    then M.
     
    Last edited: Aug 1, 2003
  4. Aug 1, 2003 #3
    In a problem like this you figure out how many moles of **** you got.

    You've got 52 of straight up BaCl2. That's 208 grams per mole, so 52/208 = 0.25 moles.

    You've got 9 grams of water at 18 grams/mole, so you've got 0.5 moles H20.

    So then if you can't figure out the rest you deserve that bad grade. (-;
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: What is BaCl2 * 5H2O
  1. What is this fruit? (Replies: 7)

  2. What is a chromatid? (Replies: 5)

  3. What's SELEX? (Replies: 2)

Loading...