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Molarity = moles of solute/volume of solution.

0.73 grams MgCl2 (1mol/95.21g ) = 0.00767 moles/0.300 Liters ( to get M, not mM )

= 2.6 X 10^-2 M

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Q: What is the molarity of0.73 g MgCl2 in 300 mL of solution?
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