N 2. Iron-59, which is used to diagnose anaemia, has a half-life of 45 days. What fraction of it is left in 90 days?

3. Assuming an ideal situation, calculate the vapour pressure of a solution composed of equal mole fraction of

benzene C6H6 and toluene C7H8 at 250C. Given the vapor pressure of pure benzene and pure toluene is 95.1

and 28.4 mm Hg respectively.

4. Calculate the freezing point of a solution composed of 92.1g of I2 in 800.0g chloroform, CHCl3 (253.8).

Given that kf for chloroform is 4.680C/m and T0 for chloroform is -63.5.

5. A solution composed by dissolving 1.5g hemocyanin in 250 ml of H2O. The solution has an osmotic pressure

of 0.00342 atm at 277K.

(a). Calculate the molar mass of hemocyanin and

(b). the freezing point of resulting solution.

Given that R = 0.0820 Latm mol−1K−1, kf = 1.86 0Cm−1.​