_______ of substance, contains 6.023 × 10 atoms or molecules.
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s number (6.023×1023) is the number of molecules present in 12 g of C12 isotope of carbon 1 mole of any/substance (at STP) contains 6.023×1023 molecules 1 mole = gram/molecular mass of a substance =32gO2 =2gH2 etc.
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