Chemistry Mole and Molar MassA series of free High School Chemistry Video Lessons from Brightstorm.
Chemistry Mole In chemistry, the mole, also called Avogadro’s Number, is a unit that is useful in converting between atomic mass and molar mass. One mole is 6.02 x 10^23 of something, which was derived from the number of atoms in 12 grams of carbon-12.
Molar Mass The molar mass of a substance is the mass of one mole of that substance. Because of the nature of the mole, the atomic mass of an element in atomic mass units is equal to the molar mass of that substance in grams. Molar mass is useful in finding the number of moles of a substance within a given sample.
Law of Conservation of Mass The law of conservation of mass states that mass is neither created nor destroyed. In a closed system, mass of reactants is equal to mass of products. The law of conservation of mass is related to the law of conservation of matter.
Empirical Formula - Molecular Formula An empirical formula is the lowest ratio of the atoms within a molecule. The empirical formula is accurate when describing ionic compounds, which cannot be broken into a single molecule unit. But when describing covalent compounds we use a molecular formula which describes the atoms within a single molecule. The ratio of atoms within a molecular formula is the same as that in the empirical formula, but it is not reduced. Molecules with the same empirical formula have the same percent composition.
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