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Author Topic: HELP! I need some help with science, quick!  (Read 1368 times)

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sphetr2

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HELP! I need some help with science, quick!
« on: March 21, 2007, 08:56:12 pm »
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!
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boykster

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Re: HELP! I need some help with science, quick!
« Reply #1 on: March 21, 2007, 09:07:04 pm »
in chemistry, M usually stands for a Mole

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

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Re: HELP! I need some help with science, quick!
« Reply #2 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.
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Proper capitalization is the difference between helping your Uncle Jack off a horse, and helping your uncle jack off a horse.

sphetr2

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Re: HELP! I need some help with science, quick!
« Reply #3 on: March 21, 2007, 09:49:48 pm »
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.

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)

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

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Re: HELP! I need some help with science, quick!
« Reply #4 on: March 21, 2007, 11:00:58 pm »
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jbox

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Re: HELP! I need some help with science, quick!
« Reply #5 on: March 21, 2007, 11:18:17 pm »
Which is often inverted in chemical reactions in order to unbind the romulanium in your solution.  ;D
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shardian

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Re: HELP! I need some help with science, quick!
« Reply #6 on: March 22, 2007, 09:22:22 am »
That is indicating the strength of the solution. In other words, how much sodium iodide is in a liter of distilled water.
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boykster

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Re: HELP! I need some help with science, quick!
« Reply #7 on: March 22, 2007, 12:21:39 pm »
Quote from: whammoed on March 21, 2007, 11:00:58 pm
capital M is molarity:
http://en.wikipedia.org/wiki/Molarity#Molarity

my bad, been about 15 years since I've done any real chemistry  ;)

- boykster (biochemist turned software developer )
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Texasmame

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Re: HELP! I need some help with science, quick!
« Reply #8 on: March 22, 2007, 12:35:37 pm »
Quote from: boykster on March 22, 2007, 12:21:39 pm
Quote from: whammoed on March 21, 2007, 11:00:58 pm
capital M is molarity:
http://en.wikipedia.org/wiki/Molarity#Molarity

my bad, been about 15 years since I've done any real chemistry  ;)

- boykster (biochemist turned software developer )

Same here.  Wow.  Mol(e).  Really takes me back to High School Honors Chem.  ;)
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