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6 June, 14:54

An aqueous magnesium chloride solution is made by dissolving 6.92 6.92 moles of MgCl 2 MgCl2 in sufficient water so that the final volume of the solution is 2.00 L 2.00 L. Calculate the molarity of the MgCl 2 MgCl2 solution.

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  1. 6 June, 17:53
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    [MgCl₂] = 0.036 M

    Explanation:

    Molarity are the moles of solute in 1L of solution.

    For this case, our solution's volume is 2L

    First of all, we convert the mass of solute (MgCl₂) to moles

    6.92 g. 1mol / 95.2 g = 0.0727 moles

    Now, we make a rule of three:

    In 2L of solution we have 0.0727 moles of solute

    Then, in 1L of solution we may have, 1L. 0.0727 mol / 2L = 0.036 M
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