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Atoms and molecules
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The number of atoms or molecules in a mole is defined such that the mass of one mole of a substance, in grams, is exactly equal to the substance's atomic or molecular weight.

For example, the molecular weight of natural water is about 18.015, so one mole of water is about 18.015 grams.

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Problems with moles

Problems with moles

1. Change 2 moles of N2 to grams. (The molecular weight of N2 is 14 grams/mole)

2. Change 36 g of C-12 to moles. (The atomic weight of C-12 is 12 grams/mole)

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