how many grams of CaCl2 need to be dssolved in 100g of water to prepare a solution which freezes at -2.0 degrees?

Question

Work this problem just like the previous one EXCEPT there is another part to the formula.
Delta T = i*K_f *m
i is the number of particles and CaCl2 will have 3. In the previous problem i=1 and I omitted it from the equation.

in this equation is Kf equal you 2 ??
okay so delta t= 2 i= 3 when you find moles do you turn them into grams and that is the answer??

K_f = 1.86^{o C/m in both problems. That is the freezing point constant for water. Solve for molality, and turn that into grams in 100 g water. Post your work if you want me to check it.}