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May 25, 2015

Homework Help: Science (Chemistry)

Posted by Michael Glass on Wednesday, October 7, 2009 at 10:35pm.

I did not understand the lesson today in my Chemistry I honors class.

We went over the Law of Conservation of Mass for roughly 15 minutes and he gave us this worksheet. Could someone please display how to do this, I'll pull a problem from the worksheet.

When 9.56g of Copper Sulfide (CuS) is heated in the presence of 4.80g of Oxygen (O), the products contain 55.4% Copper Oxide. What is the total mass of products? What mass of copper oxide is formed?

My equations so far looks similar to this:

CuS + O -----> CuO 55.4%
9.56g .36g xg

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