Question

A sample of seawater taken from the Atlantic Ocean freezes at –2.14 °C and a sample from the Arctic Ocean freezes at –1.96 °C. Assume i = 2.

What is the molality of the Atlantic Ocean sample?
What is the molality of the Arctic Ocean sample?

Answer 1

Two problems here. For each,
dT = i*Kf*m
Plug in and solve for m for each.

Answer 2

How do you solve for Kf in this problem?

Answer 3

Kf is something you look up. It's value for water is 1.86 C/m.