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Avogadro's constant
· Avogadro's constant is the number of atoms in 1g of
1
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
atom/molecule
· 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
Mr
· Learn this equation, it's pretty important…read more

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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
contains.
(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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Oops
Try again…read more

Slide 6

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

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Slide 9

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Slide 10

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Comments

Sanahkhan

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Thank you soooooooooooooooooooooooooooooooooooo much I really needed this!!!

my chem tech is Lousy and u have honestly saved   my     life :)

 

hellman

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very nice helps alot


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