4FeS2 + 11O2 ==> 8SO2 + 2Fe2O3
Use PV = nRT and solve for n = number mols O2.
Using the coefficients in the balanced equation, convert mols O2 to mols Fe2O3.
Then convert mols Fe2O3 to grams. g = mols x molar mass.
Iron pyrite (FeS2) is the form in whichmuch of
the sulfur exists in coal. In the combustion of
coal, oxygen reacts with iron pyrite to produce
iron(III) oxide and sulfur dioxide, which is a
major source of air pollution and a substantial
contributor to acid rain. What mass of Fe2O3
is produced from 87 L of oxygen at 2.38 atm
and 163�C with an excess of iron pyrite?
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