Question

calculate number of particle present in 4g molecule of oxygen

Answer 1

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 ofoxygen.

Answer 2

7.52×1022 is the no. of moles