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The number of particles atoms, molecules or ions pr esent in 1 mole of any substance is fixed, with a value of 6. The mass percentage of hydrogen h in water is a 11. Here you can read chapter 3 of class 9 science ncert book. Cbse class 9 science chapter 4 structure of the atoms notes in pdf are available for free download in mycbseguide mobile app. Jun 22, 2017 online test of chapter 3 atoms and molecules 1 science class 9th questions. Ncert exemplar solutions for class 9 science chapter 3. This document is highly rated by class 9 students and has been viewed 655 times. Chapter wise ncert solutions for class 9 science chapter 3 atoms and molecules chemistry solved by expert teachers as per ncert cbse book guidelines. A mole or mol is the amount of a substance which contains the same number of chemical units atoms, molecules or ions as there are atoms in exactly 12 grams of pure carbon12.
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