Limiting Reagent Problem

Limiting Reagent Problem - Limiting Reagent Calculations A...

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Limiting Reagent Calculations A general procedure for calculations: (i) If masses of each reactant are given, they must be converted to mole quantities. If moles are given, go on to step (ii) (ii) Calculate how much product (as moles) could be formed from each reactant. Use ratios of the coefficients in the balanced equation. Reactants react in these ratios. (iii) Compare the amounts of product that could be formed and determine which is least . The reactant that makes the LEAST amount of product is “Limiting Reagent” and no more product can be formed no matter how much of the other reactants are available. (iv) If the question asks for mass of product, convert this “least amount” to mass. (v) If the question asks for the amount of excess reagent that is left over: Find the moles of the excess reagent required to fully react the limiting reagent. Subtract “reacted moles” from total moles available. This gives the moles left over. Convert these “left over” moles to mass, if required. Advice: Not every problem requires every calculation. READ the problem to see what information is supplied and what is being asked for.

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