Posted by Chris Sung on Friday, October 29, 2010 at 1:20am.
Convert 0.5 mol Al(OH)3 to moles Al2(SO4)3.
Convert 0.5 mol H2SO4 to moles Al2(SO4)3.
It is likely the number for moles Al2(SO4)3 will not be the same so one of them must be wrong. The correct answer, in limiting reagent problems is ALWAYS the smaller value and the reagent producing that value is the limiting reagent.
After identifying the limiting reagent, convert moles of it to moles of the non-limiting reagent and subtract from the initial amount to identify the excess
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