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Moles
And today's question.
Why do we need ANOTHER unit?
What we already know
Atoms of an element are all the same (not quite true, later we will talk about this)
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
1.008 grams of Hydrogen
60200000000000000000000000 atoms
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with practice
Year 8 - 4th December 2015 - Lesson 2 [Moles]
By Gavin King
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Year 8 - 4th December 2015 - Lesson 2 [Moles]
introduction to moles
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Gavin King
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