A solution is made by dissolving 23.0 g KOH in 1.60 L H2O. What is the molality of the solution? The density of water is 1.00 g/ml. Use the periodic table in the toolbar if needed.

Question

Chemistry

Bradshaw

25 November, 22:29

A solution is made by dissolving 23.0 g KOH in 1.60 L H2O. What is the molality of the solution? The density of water is 1.00 g/ml. Use the periodic table in the toolbar if needed.

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Miguel Jenkins · Answer 1

The molarity of a solution is defined as the moles of solute dissolved per kilogram of solvent. Therefore, we first compute the moles of KOH using:

Moles = mass / Mr

Moles = 23 / 56

Moles = 0.41

The volume of solvent is 1.6 liters

The density is 1 gram/cm³ = 1 kg/L

Mass of solvent = density * volume

Mass of solvent = 1 * 1.6

Mass of solvent = 1.6 kg

Molality = moles / kilogram

Molarity = 0.41 / 1.6

Molarity = 0.26

The molality of the solution is 0.26 molal.