I'm not as lost as I my seem, yes I can rearrange that formula.
∆Tb = Kb * mB can be rearranged to mB = ∆Tb / Kb
I know that molality is moles of solute divided by kilograms of solution.
I know that carbon tetrachloride is covalnt, so it does not dissociate.
Then I started to try and subsitute numbers which is where I got lost. I made ∆Tb 0.49 because it is the change in elevation. Kb, the boiling point elevation constant for carbon tetrachloride I made 4.95. Therefore my molality was 0.09898. Is this correct? Where do I go from here?