Hello,
The number of moles of Oxygen in 1 Mole of CO = 1
Hence, number of moles of Oxygen in 5 Moles of CO = 5.
The number of oxygen atoms present can be obtained by multiplying the moles of oxygen by Avogadro's Number.
So, number of oxygen atoms present = 5 x ( 6.023 x 10^23 ) = 30.115 x 10^23 nos.
Best Wishes.
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