PercentYield - HOW TO CALCULATE THE PERCENT YIELD OF A...

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CHEM 2423 Lab / Spring 2003 p. 1 H OW TO C ALCULATE THE P ERCENT Y IELD OF A R EACTION The percent yield is a measure of the efficiency of a recovery or synthesis procedure and is defined as: % yield mass (or moles)of product actuallyobtained mass (or moles)of product expected 100 Example 1 Calculate the amount of t -butyl benzene expected from 3.70 g t -butyl chloride and excess benzene according to the following equation: (CH 3 ) 3 C–Cl + C 6 H 6 à (CH 3 ) 3 C–C 6 H 6 + HCl t -butyl chloride t -butyl benzene MW = 92.5 g/mol 134 g/mol The relative molar ratio in the reaction is 1:1 à 1:1. Thus, from 3.70/92.5 = 0.040 moles of t -butyl chloride, one would expect 0.040 moles of t -butylbenzene, which is equal to 134 x 0.040 = 5.36 g. 3.70 g t butyl chloride mol t butyl chloride 92.5 g t butyl choride 1mol t butylbenzene butyl chloride 134 g t butylbenzene mol t butylbenzene 5.36 g t butylbenzene =− So, grams limiting reagent 1
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PercentYield - HOW TO CALCULATE THE PERCENT YIELD OF A...

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