A dilute solution of an ionic compound \( A_3B \) has an osmotic pressure which is 6 times that of 0.02 M \( \text{MgCl}_2 \). What is the molar concentration of \( A_3B \), assuming that it undergoes complete dissociation in water?
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When dealing with osmotic pressure, remember that the van't Hoff factor represents the number of particles produced by dissociation of the solute. The higher the dissociation, the larger the van't Hoff factor.