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Stoichometry the calculation of quantities in chemical equations (form of bookeeping) Coefficient Coefficient of a balanced equation give you the relative numbers of moles of reactants and products in the chemical reaction Mass and atoms are conserved in every chemical reaction STP Mass-volume, volume-volume, and particle-mass Limiting reagent limits or determines the amount of product that can be formed in a reaction Excess reagent the quantity of a excess reagent is more than enough to react with a limiting reagent. Theoretical yield When an equation is used to calculate the amount of product that will form during a reaction, a value for theoretical yield is formed. Actual yield In contrast the amount of product that forms when the reaction is carried out in the laboratory is called the actual yield. Percent Yield the ratio of the actual yield to the theoretical yield expressed as a percentage.