Chemistry Practice Problems Molality Practice Problems Solution: A solution was prepared by dissolving 39.0 g of KC...

Solution: A solution was prepared by dissolving 39.0 g of KCl in 225 mL of water.  Calculate the molality of KCl in the solution.

Problem

A solution was prepared by dissolving 39.0 g of KCl in 225 mL of water.  Calculate the molality of KCl in the solution.

Solution

We’re being asked to calculate for the molality of the solution prepared by dissolving 39.0 g of KCl in 225 mL of water

 When calculating for molality, we use the following equation:


We will calculate the molality of the solution using the following steps:

Step 1: Calculate the moles of solute.
Step 2: Calculate the mass of the solvent (in kg).
Step 3: Calculate the molality of the solution.


KCl → dissolved in water → Solute

Water (H2O) → where KCl is dissolved → Solvent


Step 1: Calculate the moles of KCl.

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