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You are watching: One mole of oxygen atoms represents

together we have actually observed, atoms are really small--too tiny to be sweet or count individually. Nevertheless, we regularly need to know how numerous atoms (or molecules, or electrons, and so on) a sample contains. To settle this dilemma, we usage a counting unit dubbed Avogadro"s number, named after the Italian scientist Amedeo Avogadro (1776-1856):

Avogadro"s number = 6.02 X 1023

just as an quantity of 12 is described by the hatchet dozen, Avogadro"s number is described by the hatchet mole. A dozen egg is 12 eggs; a mole of atoms is 6.02 X 1023 atoms. Avogadro"s number have the right to be used to count anything. You could have a mole of apologize or a mole of Ping-Pong balls. Friend can acquire some idea the the size of Avogadro"s number by considering that a mole that Ping-Pong balls would cover the surface of the planet with a layer roughly 60 mile thick. Avogadro"s number is shown here to three far-ranging figures, i beg your pardon is the degree of accuracy usually forced in calculations. Actually, the number of items in a mole has been established to six or more far-reaching figures, the specific number depending on the an approach by which the number was determined. One mole of any substance contains 6.02 X 1023 devices of the substance. Equally necessary is the fact that one mole of a substance has actually a mass in grams numerically equal to the formula weight of the substance. Thus, one mole of an facet has a mass in grams equal to the atomic load of that element and also contains 6.02 X 1023 atom of the element. Because that those aspects that execute not take place as solitary atoms - that is, the diatomic gases, sulfur, and phosphorus - it is necessary to be certain that girlfriend specify what you room talking about. One mole of atom of oxygen has actually a massive of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atom of oxygen. One mole the oxygen gas, which has the formula O2, has actually a fixed of 32 g and also contains 6.02 X 1023 molecule of oxygen however 12.04 X 1023 (2 X 6.02 X 1023) atoms, since each molecule the oxygen includes two oxygen atoms. These definitions enable a new meaning of atomic weight: The atomic load of an aspect is the massive in grams the one mole of naturally arising atoms of the element.

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making use of these relationships, we deserve to calculate the variety of atoms in a offered mass the an facet or the massive of a given variety of atoms.
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