What is the molarity of pure water?

Answer 1

The Molarity of H2O is dependent on temperature and pressure. Like any calculation of molar concentration it is the moles per liter.

At 25oC and 1 atmosphere of pressure the density of water is 997.0479 g/L, and the molar mass of water is 18.01528 g/mol. This means there are 55.345 moles of H2O in 1 L of water, so it is 55.345 M.

Answer 2

The density of liquid water is 1000 grams / liter. Since molarity is given by moles per liter, convert 1000 grams into moles.

1000 grams (1 mole/18.02 grams) = 55.49 moles

So, 55.49 moles per liter = 55.49 M.

Molarities for solid and gaseous water are different; densities are different, but same steps as I showed for solving.

Answer 3

Molality of pure water is 55.5. it can be calculated as

m = no of moles/ Kg of solvent

For Pure water

in this case water is act as both solute and solvent, so no of moles in 1 kg of water is 55.5 (1000/18).

m = 55.5/1

= 55.5

Answer 4

The molar mass of water is 18 g/mole. In one liter, at 4ºC there will be 1000 g (density = 1g/ml). Thus, 1000g x 1 mol/18 g = 55.56 M. At 25ºC, the density of water is ~1.18, thus, 1000 ml x 1.18g/ml = 1180g. The molarity will be 1180 g x 1 mol/18 g = 65.56 M

Answer 5

The molarity of water depends with the amount of water. To calculate the molarity of water, the number of moles of a solute is usually divided by the liters of the solution.

Answer 6

it depends on the concentration of the solution that is, the amount of salt in the amount of water

Answer 7

The molality of water is about 55.6 M. This measurement is only for pure water, as anything with minerals or other water-based solutions will affect the molality.

Answer 8

Molarity of water is 55.5 mol/L

Answer 9

55.6