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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
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)