how do you count atoms?
2006-11-01 10:28:45 · 6 answers · asked by lil_flirt_57<3 2 in Science & Mathematics ➔ Chemistry
ex...how many atoms in ...lets sayyy..
Al2SO4
2006-11-01 10:37:44 · update #1
Your question is kind of general so I'll try to explain as best I can:
If you want to know how many of each type of atom in a molecule, the formula will give you that info
For example H2O has two Hydrogen atoms bonded to one Oxygen atom making a total of 3 atoms
6H2O is 6 molecules of water so it has 12 Hydrogen atoms and 6 Oxygen atoms
In a reaction a molecule will be given in terms of moles so 6H2O means 6 moles of water
That means there are (6.02 x 10^23) x 6 molecules of water.
so to find the number of atoms of Hydrogen in 6 moles of H2O
multiply 6 x 2 x (6.02 x 10^23) and to find the number of atoms of Oxygen in 6 moles of H2O multiply 6 x (6.02 x 10^23)
Now let's say you want to know how many atoms of Hydrogen are in 10 g of water.
We know that the molecular weight of water is 18g.
So to find the number of moles divide by the molecular weight.
10/18 = .55moles
now multiply .55 x 2 (because water has two atoms of Hydrogen in it) x (6.02 x 10^23) and that will give you the number of Hydrogen atoms in .55 moles (10g) of water.
2006-11-01 10:34:23 · answer #1 · answered by Anonymous · 0⤊ 1⤋
To find our how many atoms in a molecule, you just add up the little numbers (they're called subscripts) after each element. No subscript=1. So for instance, Al2SO4 contains 7 atoms per molecule--2 Al, 1 S and 4 O.
2006-11-01 10:49:56 · answer #2 · answered by Amy F 5 · 0⤊ 0⤋
First you find the mass, then you divide by the atomic mass of the substance (found in the periodic table), then you multiply by Avogadro's Number (6.022*10^23)
2006-11-01 10:31:54 · answer #3 · answered by invincibleshield 2 · 0⤊ 0⤋
A Lewis acid is an e⁻ pair acceptor a Lewis base is an e⁻ pair donor. H3N:(g) + BF3(g) → H3N:→BF3(white s) a lewis acid-base adduct. This gives B an 8e⁻ (it is the Lewis acid) configuration. The N:→B bond is a dative covalent bond not an ionic bond. There is a partial charge separation viz δ+N:→Bδ- but not enough for the bond to be considered as an ionic bond
2016-03-28 03:56:31 · answer #4 · answered by Anonymous · 0⤊ 0⤋
you have the Avogadro number = 6.02*10^23
you can find the moles of the substance then multiply it with this number to find out the number of atoms it has
2006-11-01 10:32:26 · answer #5 · answered by James Chan 4 · 0⤊ 0⤋
58*68
2016-10-24 11:37:01 · answer #6 · answered by mongil9643 1 · 0⤊ 0⤋