What mass of na2so4 must be dissolved in 104 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 2.88.

The mass of that must be dissolved is 6.89 grams.

Explanation:

Depression in freezing point is given by:

= Depression in freezing point

i= vant hoff factor = 2.88

= freezing point constant =

m= molality

Weight of solvent (water)= 104 g = 0.104 kg  

Molar mass of = 142 g/mol

Mass of added = ?

The mass of that must be dissolved is 6.89 grams.

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