Find the Percentage yield of [1,3,5-C6H3(CH3)3]Mo(CO)3 and discussion of factors responsible for the low yield? Procedure: 0.5 g...

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Chemistry

Find the Percentage yield of [1,3,5-C6H3(CH3)3]Mo(CO)3and discussion of factors responsible for the lowyield?

Procedure: 0.5 g (~ 1.9 mmol) of Mo(CO)6 was added with 5mL(~36mmol) of mesitylene.  The apparatus is assembled inthe hood using a straight reflux condenser. The Mo(CO)6 is volatilewhen heated and will sublime into the condenser during thereaction. Pass nitrogen over the reaction mixture continuouslyduring the reaction. After 25 min, stop reflux When the solutionhas cooled to room temperature, add 8 mL of hexane to complete theprecipitation. Suction filter the solution and rinse the yellowproduct (that is contaminated with black metallic molybdenum), with5 mL of hexane. Purify the crude product by dissolving it in aminimum of CH2Cl2(no more than ~ 5 mL). Filter your solution andthen add ~15 mL of hexane to the filtrate liquid to precipitate theproduct. Suction filter off the yellow [1,3,5-C6H3(CH3)3]Mo(CO)3precipitate, wash twice with 4 mL of hexane, and allow the productto dry.

Initial mass 0.5 g of Mo(CO)6, product at the end 0.05g

Answer & Explanation Solved by verified expert
3.9 Ratings (609 Votes)

Mo(CO)6     --------------> [1,3,5-C6H3(CH3)3]Mo(CO)3

264 g                                  300 g

0.5 g                                    ?

? =  ( 0.5 g/ 264 g ) x 300 g of product

    = 0.568 g

This is theoretical yield of product = 0.568 g

But, given that actual yield of the product = 0.05g

Hence,

   % yield = (actual yield/ theoretical yield) x 100

               = (0.05 g/ 0.568 g) x 100

               = 8.8 %

% yield of [1,3,5-C6H3(CH3)3]Mo(CO)3 = 8.8 %


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