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Topic: mols-basic equations?  (Read 4553 times)

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Offline clay

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mols-basic equations?
« on: October 19, 2006, 08:53:56 PM »
i need last-minute help before a test tommorrow-
equations for the following needed:

molar mass-

mass percent of elements-

empirical formulas-

how to find # of; particles,atoms,ions..
                         
volume(gas&liquid):converting

 ???



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Offline mrdeadman

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Re: mols-basic equations?
« Reply #1 on: October 19, 2006, 08:59:49 PM »
Molar mass is the weight of the atom. so basically look at carbon: carbon's mass is 12 so a mol of carbon is 12 grams. Empirical formula is just the lowest of the subscripts of a molecular formula. so if you have
 H2O2 empirical formula is HO. There are 6.02 * 10^23 atoms/particles in a mol of atoms/particles.

But seriously: if you don't know this stuff and it's on the test tomorrow...
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Offline constant thinker

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Re: mols-basic equations?
« Reply #2 on: October 19, 2006, 09:00:28 PM »
http://en.wikipedia.org/wiki/Molar_mass
Working with numbers and percents in general you should know because it's basic algebra.
http://en.wikipedia.org/wiki/Empirical_formula
http://en.wikipedia.org/wiki/Avogadro%27s_number
Basic dimensional analysis.

A really important site.

Wikipedia and google are your friends, don't forget.
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Offline Borek

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Re: mols-basic equations?
« Reply #3 on: October 20, 2006, 02:58:46 AM »
Quote from: mrdeadman on October 19, 2006, 08:59:49 PM
Molar mass is the weight of the atom

Mass of a mole of atoms/ions/molecules.
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