Can anyone easily explain mole metric conversions? I'm not understanding Avargados number in relation to a mole?

another thread on this topic: http://www.fluther.com/73973/can-someone-explain-moles-and-osmoles-to-me/

I’ll try my best.
The definition of a ‘Mole’ is the amount of a substance present in 6.02×10–23 particles.(The word ‘particle’ can refer to an atom, ion, molecule or the sub-atomic particles).
For example:
1 Mole of H (Hydrogen)= 6.02×10–23= 1g.
The ‘1g’ being the molecular mass of hydrogen.

Another example:
1 Mole of H2 (Hydrogen molecule)= 6.02×10–23= 2g.
The molecular mass here is ‘2g’ as it’s not an atom of hydrogen, it’s a molecule.

The ‘Avogadro Constant’ tells us about the amount of substance present in 1 Mole.
As 1 mole= 6.02×10–23 particles.
If the number of moles change, the constant is multiplied by the particular changed number.

Another example:
1 mole of H2O2 (Hydrogen peroxide)= 6.02×10–23= 34g.

I mentioned the word ‘Particles’ before. Here’s how that works:

1 Mole of H20 (Water)= 6.02×10–23 (Molecules)= 18g.

1 Mole of Mg (Magnesium)= 6.02×10–23 (Atoms)= 24g.

Water is a ‘molecule’, Magnesium is an ‘atom’.

‘1 Mole of any particle will always be 6.02×10–23 particles.’

Attention @all: And don’t forget to spell “Avogadro” correctly.

Thanks! I was too busy typing my answer to check my spelling!

@Ayesha: You did the hard part. Now, get back to work…

@Ayesha well done! Boy that takes me back. I used to irritate the Chem TA’s by referring to the Avocado number. You could actually see the hairs raise on her arms and back of her neck. (not that this reaction made me do it more.. XD )

@majorrich Lol! Being a pre-med student it’s all in my head right now, but thank you!

What helped me get it a long time ago was just thinking of a mole as a quantity of something, like a dozen, a couple, or a gross. It’s just a word to describe a number instead of saying 6.02×10^23 every time. And like @Ayesha says, the molecular (or molar) mass of an element is how many grams a mole of it would weigh. A mole of carbon atoms weighs about 12g. Chlorine is a larger atom, so a mole of that weighs about 35g. Sort of like how a dozen small eggs won’t weigh as much as a dozen jumbo eggs. Hope that helps. Chemists use that number on a daily basis.

@cockswain GA!