Taking into account the definition of molarity, the molarity of the solution is 2.7098 moles of MgCl₂/liter.
<h3>Definition of molarity</h3>
Molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
molarity= number of moles÷ volume
<h3>Molarity of the solution in this case</h3>
In this case, you know that the molar mass of MgCl₂ is 95.21 g/mole [molar mass is the amount of mass that a substance contains in one mole.]
You can apply the following rule of three: If by definition of molar mass 95.21 grams are contained in 1 mole, 258 grams are contained in how many moles?
amount of moles= (258 grams× 1 mole)÷ 95.21 grams
<u><em>amount of moles= 2.7098 moles</em></u>
Replacing in the definition of molarity:
258 g of MgCl₂/liter= <u><em>2.7098 moles of MgCl₂/liter</em></u>
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Finally, the molarity of the solution is 2.7098 moles of MgCl₂/liter.
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