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Osmotic Pressure

Calculate the...

Question

Calculate the molality of water if its density is 1000 kg/m³.

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Solution

Molality is the unit of concentration measured by the number of moles of solute per kilogram of solvent.

Molar weight of water is 18

18 g water ≡ 1 mol
1 g water ≡ 1/18 mol
1000 g water ≡ 1000/18 mol = 55.56 mol

So molality of water 55.56.

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