Posted by willie on Tuesday, January 8, 2013 at 11:04pm.
mols = grams/molar mass.
Then M = mols/L soln.
Technically this problem can't be solved because the definition of M is mols/L solution. You have added MgF2 to 55 mL H2O. I'm sure your prof expects you to use 0.055 L BUT 31 g MgF2 in 55 mL H2O gives more than 55 mL of solution.
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