The freezing point depression constant f...

The freezing point depression constant for water is `-1.86^@C m^(-1)`. If 5.00g `Na_2SO_4` is dissolved in 45.0 g `H_2O` the freezing point is changed by `-3.82^@C`, calculate the van't Hoff factor for `Na_2SO_4`.

0.381

2.63

2.05

3.11

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