2007-10-25 11:30:45 · 0 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
grams to moles look up FW on the periodic table and divide grams by that to get moles.
moles to grams look up FW on the periodic table and multiply moles by that to get grams
atoms to moles divide # atoms by 6X10^23.
FW is the atomic weight of all the atoms in the compound added up.
2007-10-25 11:37:54 · answer #1 · answered by Cindy B 5 · 0⤊ 0⤋
It is dependent upon the compound... all that you need is the compound's atomic mass unit (amu) or gram molar mass, they are the same thing. The amu is actually the grams of compound you need to get one mole in one liter.
For example, the amu of sodium chloride (NaCl) is 58.5. Thus, 58.5 grams is equal to one mole. If you have 2.4 grams, then 2.4/58.5 = 0.04 moles
To convert moles to grams, you just do the opposite: 0.04 moles x 58.5 = 2.4 grams
And finally, you cannot change atoms to moles as a mole is 6 x 10^23 molecules of the compound, not atoms. But if you know how many moles you have, simply multiply it by 6x10^23, and you have the number of molecules present.
2007-10-25 11:44:03 · answer #2 · answered by Anonymous · 1⤊ 0⤋
find out the molar mass of the substance that you are trying to convert. e.g. hydrogen has a molar mass of 1.01g (when not diatomic, meaning just H, not H2 like it is usually found) ad water has a mass of 18.02g/mol. (2 hydrogen and 1 oxygen)
take the mass (in grams) of the substance and divide it by the molar mass.
so if you have 36.04 grams of water, divide it by 18.02 and that means you have 2 mol of water.
do the opposite when you have moles and need to convert to grams; then it is molar mass times moles.
To find the number of atoms from grams, take the number of moles (which is explained above) and multiply by 6.02x10^23 (the molar number)
2007-10-25 11:38:48 · answer #3 · answered by Steve 7 · 1⤊ 0⤋
g to moles: find Molar Mass of the compound by adding together the atomic masses of all the atoms. That will be the Molar Mass in g/mol. Ex: NaOH 1 Na @23 + 1 O @ 16 + 1 H @ 1 = 40g/mol NaOH.
to find moles: mol = g/MM
to find g: g = mol* MM
atoms to moles: 6.02 x 10^23 atoms = 1 mol
divide # atoms by 6.02 x 10^23 atoms/mol
mol = # atoms / 6.02 x 10^23 atoms/mol
2007-10-25 11:40:25 · answer #4 · answered by papastolte 6 · 0⤊ 0⤋
look here:
http://en.wikipedia.org/wiki/Mole_%28unit%29
It says grams cannot be equivocated to moles. Gram moles are different to grams. The atomic equivalent is also explained.
2007-10-25 11:44:40 · answer #5 · answered by dave 2 · 0⤊ 6⤋