Balancing Chemical Equation

  1. 1. The problem statement, all variables and given/known data
    Copper (II) Chloride dihydrate is mixed with solid aluminum. Find the products and balance the equation.


    2. Relevant equations
    N/A


    3. The attempt at a solution
    The original equation that I got was:
    CuCl2 ∙ 2H2O + Al --> AlCl3 + Cu + H2O
    When I balanced it, I got:
    3 CuCl2 ∙ 2H2O + 2 Al --> 2 AlCl3 + 3 Cu + 2 H2O
    but I'm unsure about that. I am just wondering if the H2O at the end of the equation should have a coefficient of 6 because 3 [CuCl2 ∙ 2 H2O] were needed. So then the equation would be:
    3 CuCl2 ∙ 2H2O + 2 Al --> 2 AlCl3 + 3 Cu + 6 H2O instead?
    I do not know which one is correct. Please help me!
     
  2. jcsd
  3. Borek

    Staff: Mentor

    Should be 6.

    Note that CuCl2.2H2O is equivalent to CuCl2(H2O)2 or even CuCl2H4O2.
     
  4. Ohh OKAY! Thanks so much!!
     
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