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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/class-12-chemistry-india/x6a5fb67b43bb54b9:solutions Expressing Concentration of Solutions Part 2: This video goes into details lining up some of the most basic and most important definitions of concentration terms like molarity, molality, mole fraction and parts per million (ppm). Feel free to check out Part 1 of this video here: https://youtu.be/FfwIi-w6Jvs Timestamps: 00:00 Introduction 01:00 Mole Fraction 03:12 Molarity, Molality 06:26 ppm - Parts per Million Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Ashish Shekhar