The roasting of iron(II) sulfide occurs according to

CHEMISTRY · Subjective · A Level · Chemistry · Amount of substance · Amount of substance

Problem

\mathrm{4\,FeS_2 + 11\,O_2 \rightarrow 2\,Fe_2O_3 + 8\,SO_2}

. A sample containing

\mathrm{25.0\,g}

\mathrm{FeS_2}

is heated in the presence of

\mathrm{20.0\,g}

\mathrm{O_2}

, and

\mathrm{11.0\,g}

\mathrm{SO_2}

is obtained. Calculate the percent yield of

\mathrm{SO_2}

for this reaction.