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HELP! I need some help with science, quick!

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sphetr2:
Good evening, BYOAC friends! I am doing a  lab the night before. It's a stoichiometry lab. In the materials it says 
       0.5M  lead(II) nitrate, Pb(NO3)2
   0.5M  sodium iodide, NaI

What unit does the M represent? Please hurry! Thanks!

boykster:
in chemistry, M usually stands for a Mole

http://en.wikipedia.org/wiki/Mole_(unit)

USSEnterprise:
IIRC, and correct me if I'm wrong, but one mole of an element is equal to it's atomic mass in grams
i.e. One mole of Helium is approximately 4 grams.

sphetr2:

--- Quote from: USSEnterprise on March 21, 2007, 09:38:48 pm ---IIRC, and correct me if I'm wrong, but one mole of an element is equal to it's atomic mass in grams
i.e. One mole of Helium is approximately 4 grams.

--- End quote ---

That is its molar mass, actually. A mole of a substance is 6.02e23 of its representative particles.


--- Quote from: boykster on March 21, 2007, 09:07:04 pm ---in chemistry, M usually stands for a Mole

http://en.wikipedia.org/wiki/Mole_(unit)

--- End quote ---

Thanks, that helps. We usually use 'mol' in chemistry for some reason.

whammoed:
capital M is molarity:
http://en.wikipedia.org/wiki/Molarity#Molarity

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