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which solution has highest freezing point if all are at the same molality

calcium chloride
sodium nitrate
potassium sulfate
iron(III) nitrate
all have same freezing point

please explain

  • chemistry -

    look at the formulas:
    CaCl2 ...three particles
    NaNO3....two particles
    Fe(NO3)3 will have the lowest freezing point (greatest freezing point depression), and sodum nitrate has the least depression, so it will have the highest fp.

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