Theoretical Yield | Actual Yield | Percentage Yield

The amount of product is termed as yield.

Theoretical Yield:

The amount of the product that is expected to be formed according to the calculations based on balanced chemical equation is called theoretical yield.

1. It is the stoichiometric amount of the product.
2. It does not require any experimental work.
3. It is always greater than actual yield.

Actual Yield:

The weighed mass or measured volume of the product formed as a result of a reaction is called actual yield.

1. It is the non-stoichiometric amount of product.
2. It requires experimental work.
3. It is often less than the theoretical yield.

This is because,

1.  Sometimes whole of the reactant do not convert into product (as in reversible reaction).
2.  Sometimes, some side reactions occur and they use up some of the reactants

        or products.

1. Sometimes some of the product is lost or spilled in handling.

Percentage Yield:

The ratio of actual yield to theoretical yield expressed as percentage is called percentage yield.

It measures the efficiency of the reaction.

Percentage Yield formula: