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1. The mole, symbol mol, is the unit of amount of substance in the International System of Units
2. The mole concept is a convenient method of expressing the amount of a substance. Any measurement can be broken down into two parts - the numerical magnitude and the units that the magnitude is expressed in. ... This is where the mole concept is widely used.
3. Silver metal is used in many bullion coins, sometimes alongside gold
4. This number (Avogadro's number) is 6.023 X 1023.

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