Lab 1 - Moles, Mass, and Volume

Just as we often work with a dozen 12 items such as

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Unformatted text preview: group them. Just as we often work with a dozen (12) items such as eggs, we work with mole s of atoms. A mole is 6.02 × 1023 of anything. It is a huge number. A mole of reams of copier paper (each 1.9 inches thick) stacked up would be 1.8 × 1019 miles high, about 1/10 of the diameter of the Milky Way galaxy. It's only 9.2 × 107 miles from the earth to the sun. A mole of pennies is more money than the US government spent in the 20th century. The number 6.02 × 1023 is Avogadro's number. This honors Amedeo Avogadro, who recognized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. Since we have an extremely large number, the mole, and these infinitesimal particles, atoms, a mole of atoms is a convenient quantity to work with in a laboratory. A mole of helium atoms has a mass of 4 grams (a bit more than a peanut) and a mole of lead atoms has a mass of 207 grams (about the mass of a coffee mug). The mass of a mole of atoms of any element is called its molar mas s . It www.webassig enc...
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This document was uploaded on 01/22/2014.

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