Answer: The mass of
that must be dissolved is 6.89 grams.
Step-by-step 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.