Homework Help: Chem- Percent Yield

Posted by Lara on Thursday, October 11, 2012 at 1:03am.

When HgO is heated, it decomposes into elemental mercury and diatomic oxygen gas. If 42.9 g of Hg is obtained from 70.1 g of the mercuric oxide, what is the percent yield of the reaction?

Chem- Percent Yield - DrBob222, Thursday, October 11, 2012 at 3:03pm
2HgO ==> 2Hg + O2
mol HgO = 70.1g/molar mass HgO = ?
Use the coefficients to convert mols HgO to mols Hg. The ratio is 2:2 which is 1:1; therefore, mols HgO = mols Hg.
Convert mols Hg to grams. g = mols x atomic mass. This is the theoretical yield (TY). The actual yeld (AY) = 42.9.
%yield = (AY/TY)*100 = ?

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