Lecture’5,’The’Mole’ - Chemistry

Lecture 5, The Mole

What is a mole?

Moles

Atomic mass unit and the mole

? amu definition: 12C = 12 amu. ? The atomic mass unit is defined this way. ? 1 amu = 1.6605 x 10-24 g ? How many 12C atoms weigh 12 g? ? 6.02x1023 12C weigh 12 g. ? Avogadro`s number ? The mole

Atomic mass unit and the mole

? amu definition: 12C = 12 amu. ? 1 amu = 1.6605 x 10-24 g ? How many 12C atoms weigh 12 g? ? 6.02x1023 12C weigh 12 g. ? Avogadro`s number ? The mole

? #atoms = (1 atom/12 amu)(1 amu/1.66x10-24 g)(12g) = 6.02x1023 12C weigh 12 g

Therefore:

Any

? 6.02 x 1023 ? 1 mole of 12C has a

mass of 12 g

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