The freezing point depression constant f...

The freezing point depression constant for water is `-1.86^(@)C m^(-1)`. If `5.00 g Na_(2)SO_(4)` is dissoloved in `45.0 g H_(2)O`, the freezing point is changed by `-3.82^(@)C`. Calculate the van't Hoff factor for `Na_(2)SO_(4)`.

0.38

2.05

2.63

3.11

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