Atoms and Atomic Structure

How do chemists use moles?

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2007-07-22 08:37:13

A mole is a number of atoms. Because atoms are very small,

rather than counting individual atoms, it is easier to count a mole

of atoms. A mole of atoms is a very large number of atoms: 6.02 x

1023 atoms.

Moles are often used to talk about amounts of chemicals. Because

different elements weigh different amounts, using the weight of a

chemical isn't always the best way to measure the number of atoms

or molecules in a sample. Moles are commonly used in this way to

talk about the concentration of a solution (for instance, the

number of moles of dissolved substance per liter of solution is

called molarity).

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