question_answer 52)

Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 27° C.

Answer:

Applying vant's Hoff equation, = iCRT =     = 0.0308mol Molar mass of CaCl2 = 40 + 2 x 35.5 = 111 g mol?1 Amount of CaCl2 dissolved = 0.0308 x 111g = 3.42 g