Equations with moles

A powerpoint I put together explaining moles. There are a couple of points where clicking might not work to move the slide along, and I'm not sure why this is, but the spacebar does work for these.

Hope someone finds this useful :)

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  • Created by: Fool
  • Created on: 22-12-09 16:36
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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

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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

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Oops
Try again…read more

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

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Comments

Sanahkhan


Thank you soooooooooooooooooooooooooooooooooooo much I really needed this!!!

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

 

hellman

very nice helps alot


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