# Solve: Molarity and Molality

Question: Ethylene glycol, C2H6O2 (MW=62.1mol) has a density of 40.0 mass percentage and a solution of ethylene glycol in water is 1.0514 g/mL at 20 EC. Calculate the molality of the solution. Calculate the molarity of the solution.

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#### Solution Preview

The solution is ethylene glycol and water.

The mass percentage of this solution is 40% and this means 40% of the mass is ethylene glycol and 60% of the mass is water.

Here I like to work with a total mass of the solution equal to 100 grams. The total mass is arbitrary, but 40% of 100 grams is 100 x (40/100) =40 grams.

So we have 40 grams of ...

#### Solution Summary

This solution provides a detailed explanation of how to approach calculating the variables being asked for in this chemistry-based problem. How to conduct all of the mathematical steps to reach the answers, is also provided in this response. This solution is about 260 words in length.