Ncert science book class 9 chemistry atoms and molecules

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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. Ncert class ix science chapter 3 atoms and molecules. Ncert solutions for class 9 science atoms and molecules. Ncert class 9 science atoms and molecules ncert book. Calculate the number of molecules of sulphur s 8 present in 16 g. If you take a grain of sand and put it under a microscope, you will be able to see that the grain is made up of tiny grains.

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