An aqueous solution is \(0.4201\) molal in Na\(_{2}\)SO\(_{4}\). It has a freezing point of \(-2.109\) °C. Determine the effective number of particles that arise from each Na\(_{2}\)SO\(_{4}\).

Use the freezing point depression constant of water \(K_f =1.86\) K kg mol\(^{-1}.\)

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