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Molality

The molality of a solution is defined as the number of moles of the solute per kilogram of solvent.
 

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Molarity is usually denoted by the letter M, and molality is denoted by the letter m.
 

Example

Calculate the molarity of a solution that contains 18.65 g of KCl in 3 liters of solution.

 

Solution

We have 18.65 grams of KCl, and the total volume of the solution is 3 liters. First, find the number of moles of KCl present. The number of moles of KCl is 0.25 mol, which can be calculated from the formula weight and the grams of solute.

 

 

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