Changes

The '''percentage yield''' is the percentage [[mass]] of a [[product]] formed in a real an [[Chemical Reaction|chemical reaction]] compared to the amount [[mass]] that would could theoretically be produced in a perfect [[Chemical Reaction|reaction]] as a [[percentage]]. ===About Percentage Yield===: The '''percentage yield''' is useful to work out the efficiency of a [[Chemical Reaction|chemical reaction]] and considering the cost of forming the desired [[product]]. ===Equation===Percentage Yield = (Actual [[mass]] of [[product]]/Theoretical maximum [[mass]] of [[product]])x100% Percentage Yield = <math>\frac{M_A}{M_T}</math> Where:: M_A = Actual [[mass]] of [[product]]: M_T = Theoretical maximum [[mass]] of [[product]] ===Factors Affecting Percentage Yield===*[[Reversible Reaction]]s - Some [[Chemical Reaction|reaction]]s are [[Reversible Reaction|reversible]] which means the [[product]]s may [[Chemical Reaction|react]] to form the original [[reactant]]s resulting in less than 100% of the theoretical maximum [[mass]] of [[product]].*[[Pure|Purity]] of [[Reactant]]s - If the [[reactant]]s are not [[pure]] then there is not as much of the original [[chemical]]s as was believed, resulting in less [[product]] being formed.*Collection of [[Product]] - Collecting and separating out the [[product]]s may not be an easy process and some of the [[product]] may be lost in the process.*Unwanted [[Chemical Reaction|Reactions]] - Sometimes there may be other [[Chemical Reaction|chemical reaction]]s which take place in the [[Reaction Mixture|reaction mixture]], this may reduce the amount of desired [[product]].