Ans :
mol salt = mass / molar mass
mol = 10.9 g / 212.27 g/mol
= 0.0513 mol
Molarity = mol / volume (L)
putting values :
0.192 M = 0.0513 mol / V
V = 0.267 L
volume in milliliters = 0.267 x 1000 mL
= 267 mL
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