1. How many grams of ethylene glycol C2H4(OH)2 are needed per kilogram of water to protect radiator fluid against freezing down to -10 degrees celsius?
2. For benzene C6H6 the freezing point constant K is 5.12 kgmol^-1 and its notmal freezing point is 5.5 degrees celsius. What is the freezing point of a solution containing 100.0 g of benzene and 20.0 g of naphthanlene C10H8 ?
3. Calculate the freezing point of a 0.2 m CaCl2 aqueous solution, assuming it dissociates completely to form ions in solution.