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There are 258 g of MgCl2/liter. What is the molarity of the solution?

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CintiaSalazar

Taking into account the definition of molarity, the molarity of the solution is 2.7098 moles of MgCl₂/liter.

Definition of molarity

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

Molarity of the solution in this case

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

amount of moles= 2.7098 moles

Replacing in the definition of molarity:

258 g of MgCl₂/liter= 2.7098 moles of MgCl₂/liter

Finally, the molarity of the solution is 2.7098 moles of MgCl₂/liter.

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