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Answer on Other Chemistry Question for emily

Question #33466
If copper is heated in the presence of an excess of chlorine gas, how much metal is needed to make 12.20 g CuCl2?
Expert's answer
To solve this problem we must write the equation of chemical reaction:

Cu + Cl2 = CuCl2

Then suppose that x is mass of metal needed forreaction. The molar mass of Cu is 64; the molar mass of CuCl2 is 135.
So, we can find x:
x = (64*12.20)/135 = 5.78g

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