Many ionic solids release heat when they dissolve in water and the solution gets warm. Sodium nitrate is unusual in that is absorbs heat chilling the solution when it dissolves. This property is used for instant cold packs. NaNO3(s) Na+(aq) + NO3-(aq) Hosol= +26.kJ/mol

If 100g of NaNO3 is dissolved in 500g of 30.3oC water, what will the final temperature of the solution be? Ignore heat capacity of NaNO3.