When excess BaCl$2($aq$)$ was added to a sample of Fe$($NH$4)2($SO$4)2($aq$)$ to determine the amount

in moles of sulfate present, $5\mathrm{.}02\backslash$times $103$ mol of BaSO$4$ was obtained. How many moles of sulfate

ions and iron ions were in the sample of Fe$($NH$4)2($SO$4)2?$