1,O2 gas contributes 21 % partial pressure in the atmosphere. What is the solubility of O2 in sea water at sea level and 25 o

C, if kH of O2 at 25 o

C is 1.20 x 10 –3 M atm.?

2, A. The solubility of AgNO3 at 10 o

C is 170 g and at 20 o

C is 222 g. Is the dissolution of AgNO3

exothermic or endothermic? Give reason for your answer.

B. ΔH solution of NaI is – 7.50 kJ / mol. Is NaI more soluble at 20 o

C or at 60 o

C? Why?

3, Assign each lattice energy value to the appropriate ionic compound.

MgI2 / LiI / NaI / MgF2 / MgO 2327 kJ / 757 kJ / 2957 kJ / 3923 kJ / 707 kJ