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Main => Everything Else => Topic started by: sphetr2 on March 21, 2007, 08:56:12 pm

Title: HELP! I need some help with science, quick!
Post by: sphetr2 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!
Title: Re: HELP! I need some help with science, quick!
Post by: boykster on March 21, 2007, 09:07:04 pm
in chemistry, M usually stands for a Mole

http://en.wikipedia.org/wiki/Mole_(unit)
Title: Re: HELP! I need some help with science, quick!
Post by: 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.
Title: Re: HELP! I need some help with science, quick!
Post by: sphetr2 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.
Title: Re: HELP! I need some help with science, quick!
Post by: whammoed on March 21, 2007, 11:00:58 pm
capital M is molarity:
http://en.wikipedia.org/wiki/Molarity#Molarity
Title: Re: HELP! I need some help with science, quick!
Post by: jbox 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
Title: Re: HELP! I need some help with science, quick!
Post by: shardian 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.
Title: Re: HELP! I need some help with science, quick!
Post by: 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 )
Title: Re: HELP! I need some help with science, quick!
Post by: Texasmame 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.  ;)