Hard Question on Math Homework concerning chemical Mass of Molecules (Problem explained in Body)

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A chemist wants to make a solution of 0.05mg of MgCl2 in 52.51mL of H2O; however, he only has MgCl2 * 6H2O to make his solution. How much water should he add if he has to make the correct concentration.

Note: The MgCl2 is 53.2% of the total MgCl2 * 6H2O Compound.

Note: In Order for the solution to remain the same, the water from the 6H2O binds with the water that will be added.

(I have been trying for 3 hours now) (This was given on an Algebra 2 Test Review Sheet.)