How many grams of Na2SO4 are required to make 350 ml of 0.5M?

How many grams of Na2SO4 are required to make 350 ml of 0.5M?
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Answer :

Molar mass Na2SO4 = 142 g/mole0.5 M = 0.5 moles/L = 0.5 moles x142 g/mole = 71 g/L350 ml = 0.350 L, therefore 71 g/L x 0.35 L = 24.85 gIf using proper significant figures, it would be 20 g
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