Stoichiometry is used to run calculations about chemical reactions, for example, the stoichiometric mole ratio between reactants and products.
The ideal relationship between products and reactants in a chemical reaction can be obtained by using a chemical reaction equation. The yield is the weight of the pure product which is isolated from the reaction." : 33 In 'the 1996 edition of Vogel's Textbook, percentage yield is expressed as, : 33 percent yield = weight of product theoretical yield × 100 In the section "Calculations of yields in the monitoring of reactions" in the 1996 4th edition of Vogel's Textbook of Practical Organic Chemistry (1978), the authors write that, " theoretical yield in an organic reaction is the weight of product which would be obtained if the reaction has proceeded to completion according to the chemical equation. The yield coefficient is defined as the amount of cell mass (kg) or product formed (kg,mol) related to the consumed substrate (carbon or nitrogen source or oxygen in kg or moles) or to the intracellular ATP production (moles)." : 168 The Compendium of Chemical Terminology defined yield as the " ratio expressing the efficiency of a mass conversion process. In chemistry, mole is used to describe quantities of reactants and products in chemical reactions.
In chemical reaction engineering, "yield", " conversion" and "selectivity" are terms used to describe ratios of how much of a reactant has reacted-conversion, how much of a desired product was formed-yield, and how much desired product was formed in ratio to the undesired product-selectivity, represented as X,S, and Y.Īccording to the Elements of Chemical Reaction Engineering manual, yield refers to the amount of a specific product formed per mole of reactant consumed.