February 20, 2017

Homework Help: chemistry

Posted by Tam on Sunday, March 20, 2011 at 10:14pm.

Lab on Determination of copper in brass. I have mass of brass at .1011g. My concentration of diluted solution's unknown is .0037957, My concentration of mg/ml Cu^2+ unknown is 241.2. My professor is asking me to determine the percent of copper. I know that %Cu=mass of Cu/Mass of brass. I know the mass of the brass, I'm not sure how to figure the mass of copper though

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