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What is the molarity of a solution made by dissolving 39.4 g of lithium chloride in enough water to make 1.59 L of solution?

Given:
[tex]\[ \text{Molar mass of LiCl} = 42.39 \, \text{g/mol} \][/tex]

Calculate the molarity in [tex]\(\left[ \frac{\text{mol}}{\text{L}} \right]\)[/tex].

Answer :

To find the molarity of the lithium chloride solution, we first determine the number of moles of lithium chloride using its mass and molar mass, and then we calculate the molarity by dividing the obtained moles by the volume of the solution.

1. Calculate the number of moles ([tex]$n$[/tex]) using the formula:
[tex]$$ n = \frac{\text{mass}}{\text{molar mass}} $$[/tex]
Given a mass of [tex]$39.4\text{ g}$[/tex] and a molar mass of [tex]$42.39 \text{ g/mol}$[/tex],
[tex]$$ n = \frac{39.4 \text{ g}}{42.39 \text{ g/mol}} \approx 0.9295 \text{ mol} $$[/tex]

2. Calculate the molarity ([tex]$M$[/tex]) using the formula:
[tex]$$ M = \frac{n}{V} $$[/tex]
Here, [tex]$V = 1.59\text{ L}$[/tex], so:
[tex]$$ M = \frac{0.9295 \text{ mol}}{1.59 \text{ L}} \approx 0.5846\ \frac{\text{mol}}{\text{L}} $$[/tex]

Thus, the molarity of the solution is approximately
[tex]$$0.5846\ \frac{\text{mol}}{\text{L}}.$$[/tex]

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Rewritten by : Jeany