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April 21, 2014

Homework Help: ap chemistry please BOB HELP ME

Posted by ana on Sunday, September 9, 2007 at 8:00pm.

Can you guys give me a clue in how to approach this problem?
Commercial brass,an alloy of Zn and Cu,reacts with Hydrochloric acid as follows:
Zn+2HCL-->ZnCl2+H2
(Cu does not reacts with HCL)When.0565g of a certain brass alloy is reacted with excess HCL,.0985g ZnCl2 is eventually isolated.
a.What is the composition of the brass by mass?
b.How could this result be checked without changing the above procedure?
I have tried converting .0985g to moles of Zn but then I do not know what to do? To be honest I don't get the question. Thanks in advance for your help.

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