Marc Vidal is right you should the yield of every step as fractions of 1 multiply them but only over a linear sequence and multiply by. A chemical equation describes the reactants on the left side reacting to form products on the right. Percentage purity mass puremass impure x 100.
You get the predicted maximum theoretical yield from a reacting mass calculation see examples further down.
Therefore the percent yield will never be 100 but it is still useful to know as a metric to base your efficiency of reaction off. You get the predicted maximum theoretical yield from a reacting mass calculation see examples further down. The calculated or expected amount of product is called the theoretical yield. A chemical equation describes the reactants on the left side reacting to form products on the right.