Theoretical Yield - working out

Question

Does anyone know a way of working this out?

A student reacts 4.83 g of salicylic acid with an excess of acetic anhydride in the presence of a few drops of phosphoric acid to make acetylsalicylic acid (aspirin), which the student then purifies. Calculate the mass of the theoretical yield of product.

Answer 1

Step 1.

balanced equation.

Step 2.

find number of moles of salicylic acid (mass / M.W)

Step 3.

use the stoiciometric mole relationship out of equation to find moles of acetylsalicylic acid

Step 4.

convert moles to mass (moles x M.W)

Answer 2

Great Question

So you would need to find out the molecular mass of a couple of things:

Salicylic Acid = 138.123g/mol

Acetylsalicylic Acid = 180.160g/mol

The reaction is a 1:1 mole ratio

~~~~~~~1 mol~~~~~~1 mol~~180.160 g

4.83 g x  _______--x---_____-x--________= 6.30g (theoretical)      

~~~~~~~138.123g~~~1 mol~~~1 mol

Your theoretical yield is 6.30 g of Acetylsalicylic Acid.