The enthalpy of solution of nitrous oxide (N2O) in water is -12 kJ/mol and its solubility at 20 oC and 1.00 atm is 0.121 g per 100. g of water. Calculate the molal solubility of nitrous oxide in water at 0.400 atm and 20 oC. Hint, first find Henry's law constant at 20 oC and 1.00 atm.