8g of oxygen contains_ number of atoms

1.	8g of oxygen contains_ number of atoms
Answer» First calculate ther NUMBER of moles of O2 USING: moles = mass / RELATIVE molecular mass = 8 / 32 = 0.25. For each molecule of O2, there are 2 OXYGEN atoms. Therefore moles of oxygen atoms = 2 x 0.25 = 0.5 1 mole of anything is 6.022 x 10^23 atoms (Avogadro constant) So number of atoms = 0.5 x 6.022 x 10^23 = 3.011 x 10^23

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