You are watching: How much mass does 1 mole of o2 gas have

as we have actually observed, atom are very small--too little to be sweet or counted individually. Nevertheless, we regularly need to know how countless atoms (or molecules, or electrons, and so on) a sample contains. To deal with this dilemma, we use a counting unit referred to as Avogadro"s number, named after the Italian scientist Amedeo Avogadro (1776-1856):

Avogadro"s number = 6.02 X 1023

simply as an quantity of 12 is explained by the term dozen, Avogadro"s number is explained by the term mole. A dozen egg is 12 eggs; a mole of atom is 6.02 X 1023 atoms. Avogadro"s number have the right to be used to counting anything. You can have a mole of apples or a mole the Ping-Pong balls. Girlfriend can acquire some idea of the magnitude of Avogadro"s number by because a mole that Ping-Pong balls would cover the surface ar of the earth with a layer approximately 60 mile thick. Avogadro"s number is displayed here to three significant figures, i beg your pardon is the degree of accuracy usually forced in calculations. Actually, the variety of items in a mole has actually been identified to six or more far-reaching figures, the exact number depending upon the technique by which the number to be determined. One mole of any substance has 6.02 X 1023 devices of the substance. Equally essential is the truth that one mole that a substance has a fixed in grams numerically equal to the formula weight of that substance. Thus, one mole that an element has a massive in grams same to the atomic load of the element and also contains 6.02 X 1023 atom of the element. Because that those elements that perform not happen as solitary atoms - the is, the diatomic gases, sulfur, and also phosphorus - it is vital to be certain that friend specify what you space talking about. One mole of atoms of oxygen has a fixed of 16 g, as 16 is the atomic load of oxygen, and also contains 6.02 X 1023 atom of oxygen. One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecule of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule that oxygen includes two oxygen atoms. These definitions permit a new meaning of atom weight: The atomic load of an facet is the fixed in grams of one mole of naturally occurring atoms of that element.

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utilizing these relationships, we can calculate the variety of atoms in a provided mass of an aspect or the massive of a given variety of atoms.
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