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You are watching: How many molecules are in 23 moles of oxygen

together we have observed, atom are an extremely small--too tiny to be weighed or count individually. Nevertheless, we often need to know how many atoms (or molecules, or electrons, and also so on) a sample contains. To deal with this dilemma, we usage a count unit referred to as Avogadro\"s number, called after the Italian scientist Amedeo Avogadro (1776-1856):

Avogadro\"s number = 6.02 X 1023

simply as an amount of 12 is described by the hatchet dozen, Avogadro\"s number is described 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 supplied to counting anything. You could have a mole of to apologize or a mole that Ping-Pong balls. Girlfriend can get some idea that the size of Avogadro\"s number by given that a mole of Ping-Pong balls would certainly cover the surface of the earth with a layer approximately 60 miles thick. Avogadro\"s number is displayed here come three far-ranging figures, i beg your pardon is the degree of accuracy usually compelled in calculations. Actually, the number of items in a mole has been established to six or more significant figures, the exact number depending on the technique by i m sorry the number to be determined. One mole of any substance includes 6.02 X 1023 systems of that substance. Equally important is the reality that one mole that a substance has actually a fixed in grams numerically same to the formula weight of that substance. Thus, one mole of an element has a massive in grams same to the atomic load of the element and also contains 6.02 X 1023 atoms of the element. Because that those facets that execute not occur as solitary atoms - the is, the diatomic gases, sulfur, and also phosphorus - it is vital to be particular that girlfriend specify what you are talking about. One mole of atom of oxygen has actually a mass of 16 g, together 16 is the atomic load of oxygen, and also contains 6.02 X 1023 atom of oxygen. One mole that oxygen gas, which has actually the formula O2, has actually a fixed of 32 g and also contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, due to the fact that each molecule the oxygen consists of two oxygen atoms. This definitions enable a new meaning of atomic weight: The atomic load of an facet is the massive in grams the one mole the naturally developing atoms of that element.

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making use of these relationships, we can calculate the variety of atoms in a provided mass of an aspect or the mass of a given number of atoms.
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