1. The solubility of sodium iodide in water is 191 g / 100. g H₂O at 30 ^oC and 257 g / 100. g H₂O at 60 ^oC. Suppose that 130. g of NaI are added to 55.0 g of water. What mass of solid is present at 30 ^oC? Will all the solid dissolve if the solution is heated to 60 ^oC?

2. If the solubility of He in water at a partial pressure of 0.25 atm is 9.25 x 10⁵ M, determine the Henrys law constant for He.