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Praxis II General Science

Category - Major Ideas

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Max mixes 2 moles of MgCl₂ into 1 liter of water and it completely dissolves. What is the molality of this solution?

Explanation

Answer: C - The molality is the number of dissolved moles of species in solution, and not the number of dissolved moles of the initial compound. In water, MgCl₂ will dissolve to become Mg²⁺ and 2 Cl- ions, for a total of 3 dissolved ions. Thus, the molality is 3.

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