This is a chemistry question please help with it!!!?
How many grams are in 5.00 X 10^24 molecules of lithium hydroxide? or LOH?
- MahkLv 51 decade agoFavorite Answer
To go from molecules to grams, divide by Avogadro's Constant (6.02*10^23) and then multiply that (which is moles) by the molar mass of LOH (7+16+1) = 24.
5*10^24 / 6.02*10^23 = 8.3 mol
8.3 mol * 24 g/mol = 199.3 g
Hope this helps.Source(s): Biochem major
- .Lv 61 decade ago
You have to first convert the molecules into moles. To get from molecules to moles, divide by Avogdro's number, which is 6.02*10^23.
5.00 * 10^24 // 6.02*10^23 = 8.30564784 Moles
As you will probably know, Mass (g) = Molar Mass (g/mol) * Moles
LiOH = 23.948g/mol
I believe you meant LiOH, not LOH
Grams = 8.30564784 Moles * 23.948g/mol
Grams = 198.903654 g
Grams = 199 g because of the 3 sig figs.