Search Menu



Actual yield  -  The amount of product that is actually produced in a chemical reaction.
Endothermic reaction  -  A reaction that requires heat energy to be carried to completion.
Enthalpy  -  The amount of heat a substance has at a given temperature and pressure.
Excess reagent  -  The reactant that is in excess in a chemical reaction. There is more than enough of it to react with the other reactant(s).
Exothermic reaction  -  A reaction that releases energy in the form of heat.
Heat of reaction  -  The change in enthalpy in a chemical reaction.
Limiting reagent  -  The reactant that limits or determines the amount of product that can be formed in a chemical reaction.
Percent yield  -  The decimal percentage resulting from dividing actual yield by theoretical yield.
Standard heat of formation  -  Unique to every substance, it is a measure of the change in enthalpy in the reaction that produces 1 mole of the substance from its constituent elements.
Theoretical yield  -  The calculated or expected amount of product to be formed in a chemical reaction.
Thermochemical reaction  -  Chemical reactions that include the amount of heat energy produced or absorbed.


Formula for Percent Yield

Percent Yield =    


δH = δH f (products) - δH f (reactants)    

Conversion Factor between kJ and kcal