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The density of a 20.3 M CH _{3}OH (methanol) solution is 0.858 g/mL. What is the molality of this solution? H_{2}O is the solvent.

a) 20.8 m

b) 97.8 m

c) 17.4 m

d) 23.7 m

e) 70.0 m

We’re being asked to calculate for the molality of a 20.3 M methanol (CH_{3}OH) 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 → CH _{3}OH**

**Solvent → water (H _{2}O)**