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April 17, 2014

# Homework Help: Chemistry URGENT

Posted by Brittany on Thursday, December 16, 2010 at 11:36am.

If a student starts with 615g of Co(NO3)2 and obtains a 57.3% yield of CoS, what mass of CoS is isolated?

Co(NO3)2 + K2S ---> CoS + 2KNO

• Chemistry URGENT - DrBob222, Thursday, December 16, 2010 at 3:49pm

Here is a worked example of a stoichiometry problem. Just follow the steps. At the end, the grams you obtain will be the theoretical yield. Then
%yield = (actual yield/theoretical yield)*100, substitute and solve for actual yield.
http://www.jiskha.com/science/chemistry/stoichiometry.html

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