# What is the molality of a solution that has 6 mol of CaCl_2 in 3 kg of water?

I think you should tell us the $\text{molality}$.
$\text{Molality" = "Moles of solute"/"Kilograms of solvent}$
You have the $\text{moles}$, you have the mass. So what's the $\text{molality}$?
Note that I would not expect this result to be terribly different from the $\text{molarity}$.