Posted by Kelsey on Tuesday, August 3, 2010 at 9:47am.
Step 1. Calculate the theoretical yield.
Step 2. Calculate percent yield.
One reason you may be having trouble is that the equation you have is not balanced.
You need a little work on the equation.
4FeS + 7O2 --> 2Fe2O3 + 4SO2
I will estimate the molar masses; you should do it more exacting than I but this will show you the procedure.
Convert 23.4 g FeS to moles. moles = grams/molar mass
23.4/88 = 0.266
Using the coefficients in the balanced equation, convert moles FeS to moles Fe2O3.
0.266 moles FeS x (2 moles Fe2O3/4 moles FeS) = 0.266 x (2/4) = 0.266 x (1/2) = 0.133 moles Fe2O3.
Now convert moles Fe2O3 to grams. g = moles x molar mass
0.133 x 160 = 21.3 g Fe2O3. This is the theoretical yield
%yield = (actual/theoretical)*100 =
(16.5/21.3)*100 = ??%
Check my work.
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