Chemistry is the study of matter and its properties.
The mole concept is a fundamental concept in chemistry that relates the mass of a substance to the number of particles it contains.
Atomic mass is the mass of an atom, while molecular mass is the mass of a molecule.
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Empirical formulas give the simplest whole-number ratio of atoms in a compound, while molecular formulas give the actual number of atoms in a molecule.
Stoichiometry is the study of the quantitative relationships between reactants and products in a chemical reaction.
The law of conservation of mass states that the total mass of the reactants in a chemical reaction is equal to the total mass of the products.
The law of definite proportions states that a compound always contains the same elements in the same proportions by mass.
The law of multiple proportions states that when two elements form more than one compound, the ratios of the masses of one element that combine with a fixed mass of the other element can be expressed as small whole numbers.
Avogadro's number is the number of particles (atoms, molecules, or ions) in one mole of a substance, and is equal to 6.022 x 10^23.
Molar mass is the mass of one mole of a substance, and is equal to the atomic or molecular mass in grams.