Biology Forums - Study Force

A) Styrene, would also be brominated using the reaction conditions in this experiment. Could it be used instead of trans-cinnamic acid to determine the mechanism of a bromination reaction? Justify your answer.
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B) Orange color in the product of a chemical reaction comes from trace impurities. Propose a laboratory technique that could be used to remove the impurities and justify your proposal.



C) Consider the chemical reaction 2 A + B → C where A has a molar mass of 50.0 g/mol, B has a molar mass of 75.0 g/mol, and C has a molar mass of 125.0 g/mol. What is the theoretical yield for the reaction if 30.0 g of A and 30.0 g of B are reacted together? Show your work.

first calculate limiting reagent

according to balanced reaction

2 x 50 g A reacts with 75 g B

30 g A reacts with 30 x 75 / 2 x 50 = 22.5 g B

but we have 30 g B. so B is excess reagent

limiting reagent = A

now

2 x 50 g A gives 125 g C

30 g A gives 30 x 125 / 2 x 50 = 37.5 g C

theoretical yield of C = 37.5 g

Orange color in the product of this reaction comes from impurities that could be separated by column chromatography. Column chromatography could easily separate this orange color and your bromination product.