Calculate the theoretical yield of benzil assuming you begin with 2.72 grams of benzoin.

Answer : The correct answer for theoretical yield = 2.73 g

Theoretical yield : It is defined as maximum amount of yield that is expected to be produce from reactants . The theoretical yield is decided by amount of product formed by Limiting Reagent .

Theoretical yield can be calculated bu using stroichiometric relation between mole of limiting reactant and product .

The reaction of Benzil can be written as :

one mole of Benzoin produces one mole of Benzil ( Image ) .

Since only one reactant , Benzoin is present so limiting reactant can be considered as Benzoin .

Theoretical yield can be calculates in following steps :

Step 1 : Conversion of mass of Benzoin to its mole .

Mass can be converted to mole using following formula :

Molar mass of Benzoin (C₁₄H₁₂O₂ ) = 212.24

Plugging value of Mass and molar in mole formula :

Mole = 0.013 mol

Step 2 : To find mole ratio of Benzil to Benzoin .

Mole ratio can be find out from balanced reaction . From balanced reaction one mole of Benzoin giving one mole of Benzil , Hence mole ratio = 1 : 1

Step 3 : Find mole of Benzil

Mole of Benzil = 0.013 mol

Step 4 : To find mass of Benzil

Molar mass of Benzil (C₁₄H₁₀O₂ ) = 210.232

Plugging value in mole formula

Multiplying both side by 210.232

Mass of Benzil = 2.73 g

Hence Theoretical mass of Benzil = 2.73 g

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.