Review of Quantitative Chemical Terms

So far, chemical equations have been described largely in terms of individual atoms and molecules. Chemistry deals with much larger quantities, of course. On an industrial level, kilograms, tons, or even thousands of tons are commonly used. It is easy to scale up to such large quantities, because the relative quantities of materials involved remain the same, whether one is dealing with just a few atoms and molecules. 

Formula mass The sum of the atomic masses of all the atoms in a formula unit of a compound. Although the average masses of atoms and molecules may be expressed in atomic mass units (amu or u), formula mass is generally viewed as being relative and without units. 

Molar mass When X is the formula mass, the molar mass is X grams of an element or compound, that is, the mass in grams of 1 mole of the element or compound. 

Mole The fundamental unit for quantity of material. Each mole contains Avogadro s number (6,022 x 10 ) of formula units of the element or compound. 

Formula Formula Mass Molar Mass Number of Formula Units per Mole 

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