how many moles of O2 are there in 1.20 * 1022 oxygen molecules????

 1 mole O2 = 6.022 * 1023 Oxygen molecules.

1.2 * 1022 Oxygen molecules = 1.2 * 1022 / 6.022 * 1023  = 0.0199 moles (approx.)

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the steps above r correct
bt the ans is 1.99 (approx)​​
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