The molal freezing point constant for water is 1.86 C/m. at what temperature will a micture of 2.00g of CalCl2 and 25.0g of water freeze?

2 answers

moles = grams/molar mass.
Solve for moles CaCl2. (You have a typo in the formula for CaCl2.)

molality = moles/kg solvent.
Solve for molality

delta T = iKf*molality
Solve for delta T; i = 3

Convert delta T to freezing point remembering the normal freezing point for water is 0 celsius.
how do i convert delta T to freezing point?