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Old 01-15-2006, 10:36 AM
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okay, there are few ways to define moles. One is the gram molecular forumla, which I previously mentioned. The gram molecular formula is the atomic weight of the compound or element in grams. The way Bman mentioned it, is by how many molecules are in a mole. If there is one mole of oxygen (O2), then there are 6.02 times 10 to the 23rd molecules of O2 in that mole. Since one oxygen has an atomic weight of 16 amu, then O2 has an atomic weight of 32 amu. 32 amu, in gram molecular formula, would equal 32 grams. So basically, 32 grams of O2 is the same as 6.2 times 10 to the 23rd molecules of O2, which is the same as one mole of O2.

The third way to define mole, but ONLY for gases. One mole of a gas (no matter what gas) takes up 22.4 Liters at STANDARD TEMPERATURE AND PRESSURE (commonly notated as STP). So one mole of O2 would also be 22.4 Liters of O2 at STP.

Hopefully, this has clarified or helped someone...
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