Moles of oxygen = 22g / 32 (Mr of O2)
Moles of oxygen = 0.7 moles (1 dp)
Avogadro's constant = 6.02×10^23 particles per mole
0.7 moles×(6.02×10^23) = Answer
This is assuming it wants O2, if it wants pure oxygen then replace 32 with 16.
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