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**Using Moles to Count Atoms**

A mole is a unit of amount like a dozen, gross or ream is used to represent a given amount.

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Mole Mole is abbreviated mol and is the number of atoms in exactly 12 grams of carbon-12. Avogadro’s constant is E23 and is the number of particles in 1 mole of any substance A mole of marbles would cover the continental U.S. to a depth of 70 miles. A mole of periods (.) placed next to each other would equal the radius of our galaxy.

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**Molar Mass The mass in grams of one mole of any substance.**

The molar mass of any substance is its average atomic mass in grams. The molar mass of Nitrogen is g/mol. There are E23 atoms in g of Nitrogen

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Conversion Factors A conversion factor is a fraction or ratio of the molar mass of a substance over 1 mol ( g N ) or 1 mol over the molar 1mol mass of a substance ( mol ) g N .

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**Using Conversion Factors**

To convert from moles to mass multiply the given number of moles by the conversion factor molar mass/1mol. To convert from mass to moles multiply the given amount of mass by the conversion factor 1mol/molar mass.

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Moles, Avogadro’s Number and Molar Mass

Moles, Avogadro’s Number and Molar Mass

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