Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g KNO₃ and 295 mL of water at 25ºC. At this temperature, the density of water is 0.997 g/mL. A) 1.51% B) 7.57% C) 13.3% D) 15.2% E) 86.7%

Question

Quizplus · Accepted Answer

To find the percent by mass, calculate the mass of the solution: mass of KNO3 (45.0 g) + mass of water (295 mL * 0.997 g/mL = 294.215 g). Total mass = 339.215 g. Percent by mass = (45.0 g / 339.215 g) * 100% = 13.3%.

Calculate the Percent by Mass of Potassium Nitrate in a Solution