Exam 3 How Big is a Mole.pdf - What is a mole A mole is a constant number much like a dozen is a constant number The numerical equivalent to a dozen is

# Exam 3 How Big is a Mole.pdf - What is a mole A mole is a...

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What is a mole ? A mole is a constant number, much like a dozen is a constant number. The numerical equivalent to a dozen is 12, while the numerical equivalent to a mole is 6.02 x 10 23 . Therefore, one mole of any kind of objects is 6.02 x 10 23 of those objects. 1 mole = 6.02 x 10 23 The mole (mol) is the SI unit for the amount of a substance. The quantity for the mole was experimentally determined and is called Avogadro’s number , in honor of Amendeo Avogadro. In chemistry, we most often count atoms, molecules, and ions. Because these particles are so tiny and impossible to see and there are so many of them, using moles is an easy way to measure quantities of these things. It turns out that if you have 1 mole of atoms, then they will have a measurable mass, in grams, that is equal to the average atomic mass of single atoms. For instance, 1 mole of carbon atoms (6.02 x 10 23 atoms) will have a mass of 12.011g. So, we can convert something that is measurable in the lab, like mass, to something that we can't measure in the lab, like the number of atoms.

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• Spring '08
• unknown
• Atom, Mole, International System of Units, Molecule, Avogadro constant

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