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Chemical reactions can be represented by balanced symbol equations using the law of . This law means that the sum of the relative of the reactants is equal to that of the . Apparent large changes in mass are usually explained by the failure to account for the mass of products or reactants. However, there will probably always be a small degree of about results whenever measurements have been made.
The constant gives the number of particles in one of a given substance. The relationship between mass and moles makes it easy to calculate unknown masses in reactions if the ratio of substances is known, or to equations if the masses of all reactants and products are known. The of a solution can also be determined if its volume and the mass of solute used are known.
Some reactions will be set up to have an of reactant A so that all of reactant B is used up. Reactant B is called the in this case.