Wednesday
April 23, 2014

Homework Help: CHem

Posted by natash on Tuesday, September 23, 2008 at 10:16pm.

Sterling silver is a mixture of silver and copper having a mole ration of silver to copper equal to 7.8 what is the mass percent composition of this mixture?

Ok I know the answer to this and I know how its done: 1 mol Cu weighs 63.5 g
7.8 mol Ag weigh 7.8(107.87)= 841g what i dont understand is why is the 7.8 multiplied with grams of Ag and not Cu?

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