Gen Chem Question from Destroyer

[dentalduck15]

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Q: The freezing point of a 0.50m Ca[C2H3O2]2 solution is -2.8 degrees Celsius. What would be the freezing point of 0.50m NaC2H3O2 solution assuming identical experimental conditions?
Answer Choices: -2.8, -3.8, -1.9, -5, +2.6 (Celsius on all choices)

Thanks

 

[gorge]

i 1=3
i 2= 2

-2.8*2/3=-1.89~-1.9