Monday
April 21, 2014

Homework Help: AP CHEMISTRY

Posted by Kris on Thursday, August 1, 2013 at 5:18pm.

Commercial brass, an alloy of Zn and Cu, reacts with hydrochloric acid as follows.
Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g)
(Cu does not react with HCl.) When 0.5093 g of a certain brass alloy is reacted with excess HCl, 0.0953 g ZnCl2 is eventually isolated.
(a) What is the composition of the brass by mass?
%Zn
%Cu

I have done this problem and got 32.42% Zn, 9.032% Zn, and 4.57% Zn and they were all wrong. I also got 35.15%Cu and that was wrong also.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

ap chemistry please BOB HELP ME - Can you guys give me a clue in how to approach...
Chemistry - Brass is an alloy that is approximately 67% Cu and 33% Zn, by mass. ...
chemistry - 1 g alloy of Cu and Zn reacted with excess of H2SO4 gives 60 ml of ...
chemistry - How do you calculate the theoretical cell voltage? 1) Zn|Zn^+2 (1M...
chemistry - How do you calculate the theoretical cell voltage? 1) Zn|Zn^+2 | Cu|...
chemistry - 15. On October 21, 1982, the Bureau if the Mint changed the ...
Chemistry Equation(again) - What I wrote is the balanced ionic equation. The ++ ...
Chemistry - In a zinc-copper cell, Zn | Zn+2(1M) || Cu+2(1M) | Cu, which ...
chemistry - the measured cell voltages are supposed to be smaller than the ...
chemistry - Lab on Determination of copper in brass. I have mass of brass at ....

Search
Members