2.0 g of oxygen contain number of atom equal to that in
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1 mole of oxygen contains 32 grams
32 grams contain 6.023*10^23 molecules
2 grams contain 6.023*10^23 *2/32 = 7.52*10^22
32 grams contain 6.023*10^23 molecules
2 grams contain 6.023*10^23 *2/32 = 7.52*10^22
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