No of atoms in 18g of O2

Dear student,
Molar mass of Oxygen is 32 g .
So , number of moles of 18 g =18/32 =0.562 moles.

We know one mole contain Avogadro number of atoms = 6.022 x 10²³ atoms.

So , 0.562 moles will contain = 0.562 x 6.022 x 10²³ = 3.38  x 10²³ atoms.

Thus 18 g of oxygen will contain  3.38  x 10²³ atoms.


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