Chapter 3: Stoichiometry: Calculations with Chemical Formulas and Equations Chapter Summary Introduction and Section 3.1 The study of the quantitative relationships between chemical formulas and chemical equations is known as stoichiometry . One of the important concepts of stoichiometry is the law of conservation of mass, which states that the total mass of the products of a chemical reaction is the same as the total mass of the reactants. The same numbers of atoms of each type are present before and after a chemical reaction. A balanced chemical equation shows equal numbers of atoms of each element on each side of the equation. Equations are balanced by placing coefficients in front of the chemical formulas for the reactants and products of a reaction, not by changing the subscripts in chemical formulas. Section 3.2
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