The measure of the quantity of moles of a product formed in relation to the reactant consumed is called percent yield. This takes place in a chemical reaction and is expressed as a percentage.
The formula for percent yield = actual yield/ theoretical yield × 100
How to calculate percent yield?
Methyle salycltae
Molecular weight = 152.15g/mol
Density = 1.184 g/ml
Mass of methyl salicylate= 0.3× 1.184 = 0.355g
Moles of methyl salicylate= 0.355g/152.15 g/ml = 0.00233 mol
Theoretidal yield = miles × product × molecular weight
= 0.002334× 180.158
= 0.420 g
%yield = actual yield/ theoretical yield × 100
= 0.15 g / 0.420 g × 100
= 35.7%
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