[crelin]

1. What would be the boiling point of a .25m(molality) BeF2 solution be? I think the formula is Kb(m)(i(particles?))
Here's what I have: .51 * .25 * 3 = .3825. So then I add .3825 to 100 (normal boiling point of H2O), so answer= 100.3825.
Is this correct?

2. This one I have no clue on this one..
The solubility of an ionic compound X in water at 27.5 C is 8.14 g/L. List all of the possible methods one might use to make more than 8.14 grams of compound X dissolve in one liter of water.

3a. An unknown compound, Z, is observed to mix with benzene but not with water. Is Z ionic or covalent?
  b. If the unknown compound Z is a liquid, will it be able to dissolve table salt?
For a, I said covalent because it mixes with benzene which is non-polar, and non-polar molecules have to be covalent?(not sure)
For b, I said no because compound Z is non-polar and salt is polar, and only compounds of the same type mix.

Any help would be greatly appreciated!