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.

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FREE Expert 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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Problem Details

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

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Molality concept. You can view video lessons to learn Molality. Or if you need more Molality practice, you can also practice Molality practice problems.

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