Q16 of 203 Page 172

How many moles of O2 are there in 1.20 × 1022 oxygen molecules?

Since One mole of O2 contains = 6.022 × 1023 molecules of oxygen

So, 1 molecule of O2 has = 1/6.022 × 1023 moles of O2


Therefore, 1.2 × 1022 molecules of O2 will have = 1.2 × 1022 / 6.022 × 1023 moles of O2


= 0.0199 moles of O2


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