The number of molecules on 1 mole of oxygen has been [tex]6.023\;\times\;10^2^3[/tex] molecules. Thus, option B is correct.
The molecule has been the smallest unit of the compound. It has been the repeating unit to form the compound.
The molecule has been formed with the combination of the elements in the fixed proportion.
The number of molecules in a mole of sample has been given by Avogadro's law. According to this, the number of molecules in a mole of sample has been equivalent to the Avogadro number.
The value of Avogadro number has been [tex]6.023\;\times\;10^2^3[/tex].
Thus, the one mole of sample has been consisted of [tex]6.023\;\times\;10^2^3[/tex] molecules.
The number of molecules on 1 mole of oxygen has been [tex]6.023\;\times\;10^2^3[/tex] molecules. Thus, option B is correct.
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