For questions 1 - 5, use the following information to answer the questions: Potassium nitrate, KNO3, also known as salt peter or Chinese salt, has been used for approximately 700 years for the manufacture of gun powder and explosives. A solution of KNO3 is prepared by dissolving 60.0 g KNO3 in 100.0 g H2O. The density of the resulting solution is 1.38 g/mL. Calculate the mass % of KNO3 in the solution.