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Balancing Chemical Equation

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Oct30-08, 03:53 PM
P: 20
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

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!
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Oct30-08, 04:41 PM
Borek's Avatar
P: 23,363
Should be 6.

Note that CuCl2.2H2O is equivalent to CuCl2(H2O)2 or even CuCl2H4O2.
Oct30-08, 05:02 PM
P: 20
Ohh OKAY! Thanks so much!!

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