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[School] – Moles, Molecules and Grams Conversion

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[School] – Moles, Molecules and Grams Conversion

Post by FaytKHZ on Mon Dec 05, 2011 8:04 pm

Tips:

The atomic mass of Silver is 107.8682 by the periodic chart I have here. That means that 1 mole of Silver masses
107.8682 grams if the Silver is pure.

I mole of any element like silver is also 6.022 X 10^23 atoms of silver.



!0^24 atoms is therefore more than a mole. You specified


2.3 x 10^24 atoms, so the number of moles will be

(2.3 X 10^24)divided by 6.022 X 10^23 = 3.819 moles



this number X 107.8682 grams/mole gives us 411.984 grams




Source(s):


Definition of the mole
------------------------------
Start out with what's given: 450 grams of Na2SO4. Use dimensional analysis to multiply it by 1 mol/142 g NA2SO4

The 142 g comes from the mass of each element given from the period table added together.

Then multiply by Avogadro's Number: 6.02 x 10 to the 23rd and divide that by 1 mol.

So really it's 450 * 1 * 6.02 x10^23 all divided by 142

1.907746 x 10^24 molecules

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Re: [School] – Moles, Molecules and Grams Conversion

Post by Link on Mon Dec 05, 2011 8:14 pm

Fayt, Fayt Fayt Fayt Fayt. -.-

Let's break down the problem.

First we need to find the number of Moles of Na2SO4 in 450 Grams.
To find the number of moles first we find the molecular mass of Na2SO4

That is 142.04 gram/moles (I checked on wikipedia). You can also find
around the molecular mass by adding up the number of all the protons and
neutrons of all the atoms in that molecule.

this means 142.04 grams of Na2SO4 would be 1 mole. We have 450 grams. So we do 450/142.04= 3.168 moles of Na2SO4

We then multiply the number of moles by a number called avogadros number (6.022 x 10^23)

3.168 x 6.022 x 10^23=

1.9077696 x 10^24 molecules of Na2SO4

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Re: [School] – Moles, Molecules and Grams Conversion

Post by Link on Mon Dec 05, 2011 8:26 pm

Molecules/ Adgrovons (wtf is his name)'s # equals the amount of moles.
Moles x Formula Mass equals the grams. Concept of conversion.

So, for H2SO4
How many grams are there in 7.5 x 1023 of H2SO4?

H2SO4 has 98.078g/mol
7.5 x 1023/ (6.0221367 x 1023) equals 1.2 moles
1.2 moles x 98.078 grams; 117.6936 grams in 7.5 x 1023 moolecules of H2SO4

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