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What Mass of Na2SO4 Must Be Dissolved in 100

Question 20

Multiple Choice

What mass of Na2SO4 must be dissolved in 100.0 grams of water to lower the freezing point by 2.50 °C? The freezing point depression constant,Kfp,of water is -1.86 °C/m.Assume the van't Hoff factor for Na2SO4 is 2.85.


A) 3.77 g
B) 6.36 g
C) 6.70 g
D) 11.3 g
E) 19.1 g

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