calculate mass of
2.5 mole of oxygen molecule
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1 g atom of oxygen = 16 g (which is equal to 1 mole) similarly 1 g molecule of oxygen = 32 g (O 2) (which is also equal to 1 mole of O 2 molecule) hence 2.5 g atom of oxygen = 2.5 x 16 = 40g.
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Number of moles = Mass / Atomic mass
• ° • Mass = Number of moles × Atomic mass
= 0.5 × 16
= 8 g
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