Moles
And today's question.
Why do we need ANOTHER unit?
What we already know
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Atoms of an element are all the same (not quite true, later we will talk about this)
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Atoms of different elements are different - hydrogen atoms are different to gold atoms - they have different masses
Water
hydrogen + oxygen -----> water
But atoms are small
really, really small,
So how can we use it?
we say that 1 mole of an element is equal to the mass in grams of the atomic mass.
1 mole of Hydrogen
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1.008 grams of Hydrogen
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60200000000000000000000000 atoms
Video on the website
Document with practice