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A great video lecture conducted by experienced chemistry teacher on 9th class chemistry chapter 1 topic avogadros number. Get full understanding or ask any questions.

Avogadro's Number, ch 1, lec 1.5, Avogadro's Number - 9th Class Chemistry

8:21

Mole (Chemist Secret Unit), ch 1, lec 1.5, Avogadro's Number - 9th Class Chemistry

15:17