What is the freezing point of a solution of 7.15 g mgcl2 in 100 g of water? k f for water is 1.86°c/m?

The relation between freezing point depression of a solution and molality is,

Δ = i

i = Van't Hoff factor = 3 as MgCl2 gives 3 ions ()

is the freezing point molar constant of water =

m is the molality of solution

Calculating the molality of solution:

= 0.751 m

Plugging in the values of m and to get freezing point of the solution:

Δ

1.solid

2.carbon dioxide

3.helium

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