solve the following problem

Question

In the experiment for the synthesis of paracetamol, 7.5 g of P-aminophenol (Mwt= 109.1 g/mol) is placed in a test tube containing 20 ml water, followed by adding 8 ml acetic acid (density=1.08 g/ml, Mwt= 102.1 g/mol). The mixture was then heated at water bath until the solid dissolved, the mixture then was left to cool down and filtered. After the filtration process, the final product was weighed out and it was found to be 3.7 g (actual weight). 

Calculate The percentage yield (% yield) of the final product which is paracetamol.

Mwt of paracetamol= 151.2 g/mol

Answer 1

This is a basic stoichiometry problem:

Find the theoretical yield of Par (Pam is reactant)

7.5 g of Pam x (1 mole/109.2 g P) (1mole Par/ 1 mole Pam)( 151.9 g/mole Par) = g Par

% Yield = (actual yield/theoretical yield)*100

I assume the MWs are correct apart from acetic acid which is 60 g/mole. Because the reactants are 1:1 in moles, it is clear that Pam is the limiting reactant and Ac A is in excess.

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