J.R. S. answered 07/20/17
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Molar mass BaCl2 = 208.2 g/mole
3.18 g x 1 mole/208.2 g = 0.0153 moles
0.0153 moles/0.500 L = 0.0305 mol/L = 0.0305 M (to 3 significant figures)