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  4. Avogadro's number is the number of molecules present in :

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Q. Avogadro's number is the number of molecules present in :

Some Basic Concepts of Chemistry

Solution:

Avogardo?s number $ (6.023\times {{10}^{23}}) $ is the number of molecules present in 12 g of $ {{C}^{12}} $ isotope of carbon 1 mole of any/substance (at STP) contains $ 6.023\times {{10}^{23}} $ molecules 1 mole = gram/molecular mass of a substance $ =32g\,{{O}_{2}} $ $ =2\,g\,{{H}_{2}} $ etc.