Posted by Theodore on Monday, May 21, 2012 at 11:16pm.
Follow the coefficients.
4 mol H2S x (3 mols O2/2 mols H2S) = 4*3/2 ?
Note how the factor in parentheses converts mols H2S to mols Oxygen. For H2O it works this way.
4 mols H2S x (2 mols H2O/2 mols H2S) = 4*2/2 = ?
See the mols H2S on the bottom cancels with H2S in the numerator and leaves the unit you want to convert to.
Now you do the last one.
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