2007-11-14 12:13:34 · 4 answers · asked by xxsoccerchickxx_84 1 in Science & Mathematics ➔ Chemistry
Since it is usually the solvent, we don't usually express its molarity, but YES we can give the molarity of water.
Molarity = moles of solute / liter of solution
One liter of water weighs 1.00 kilograms or 1000 grams, right?
So the number of moles of water = 1000 grams / 18 grams/mole = 55.5 moles
So the molarity of water = 55.6 moles / 1.00 liter = 55.6 Molar
2007-11-14 12:23:52 · answer #1 · answered by Dennis M 6 · 0⤊ 0⤋
Yes. This can be determined if the density and molecular weight of water is known
(D ~ 1000g/L, mw ~ 18g/mol)
Suppose we have 1 liter of water.
Density = mass / volume
mass = volume x density
mass = (1L)(1000 g/L)
Liters cancel. We have 1000g of water.
1000g x (1mol H2O / 18g H20) = 55.6mol
This is 55.6 mol of water.
M = mol / L = 55.6 mol / 1L = 55.6
Water has a molarity of about 55.6.
2007-11-14 20:32:19 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Yes, but it's a bit of humor.
Atomic weights: H=1 O=16 H2O=18
1000gH2O/1LH2O x 1molH2O/18gH2O = 55.6 moles per L (LOL)
2007-11-14 20:22:44 · answer #3 · answered by steve_geo1 7 · 0⤊ 0⤋
Yes. You can calculate the number of moles of water in a Liter.
mol H2O = 1000g/L 18.00g/mol = 55.56mol/L = 55.56M
2007-11-14 20:21:35 · answer #4 · answered by papastolte 6 · 0⤊ 0⤋