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Avogadro's constant
· Avogadro's constant is the number of atoms in 1g of
H.... or in 12g of 12C, or in 4g of 4He, or anywhere
where the weight in grams is equal to the Ar/Mr of the
· This number is 602,200,000,000,000,000,000,000...
· But we're allowed to be lazy and write it as: 6.022 x 1023
· So, one mole of a substance is 6.022 x 1023 molecules of
it. This makes molar equations much easier…read more

Slide 3

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Moles in a solid
· To find the number of moles in a solid:
Number of moles = mass in grams
· Learn this equation, it's pretty important…read more

Slide 4

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Lets try one
· Get some paper and a calculator out if you need them,
you're about to try and work out a question:
· An ice cube weighs 3g. Assuming this ice cube contains
only pure water, calculate the number of moles it
(Ar of H = 1, Ar of O = 16)
· Click the answer below which you think is correct
6 0.167
6.188 0.176…read more

Slide 5

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Try again…read more

Slide 6

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Moles = mass
=_ 3 _ = _3_
(1+1+16) 18
= 0.167
Next…read more

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very nice helps alot

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