calculate the number of molecules in 4g of oxygen.

Mass of oxygen (O2) = 4g

Molecular mass of oxygen = 32 g

Number of molecules of oxygen = Avogadro number x( mass of oxygen  / molecular mass of oxygen)

Number of molecules = 6.023 X 1023 molecules x (4g  / 32g) = 7.52X 1022molecules

so, 7.52X  1022molecules are present in 4g of oxygen.

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mass of substance = 4g 

molecular mass of substance = 16g

By using the formula,

                                   mass of substance / molecular mass of substance 

we get,                     =  4 / 16 = 0.25 molecules

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