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Solution: The density of a 20.3 M CH 3OH (methanol) solution is 0.858 g/mL. What is the molality of this solution? H2O is the solvent. a) 20.8 m b) 97.8 m c) 17.4 m d) 23.7 m e) 70.0 m

Problem

The density of a 20.3 M CH 3OH (methanol) solution is 0.858 g/mL. What is the molality of this solution? H2O is the solvent. 

a) 20.8 m 

b) 97.8 m 

c) 17.4 m 

d) 23.7 m 

e) 70.0 m



Solution

We’re being asked to calculate for the molality of a 20.3 M methanol (CH3OH) solution. 

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 mass of the solute.

Step 2: Calculate the mass of the solution.

Step 3: Calculate the mass of the solvent (in kg).

Step 4: Calculate the molality of the solution.

Solute → CH3OH

Solvent → water (H2O)

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