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Q.
The number of gram atoms of oxygen in $0.2 \times 10^{24}$ CO molecules is
Some Basic Concepts of Chemistry
Solution:
$6.02 \times10^{23}$ molecules of $CO = 1$ mole of $CO$
$6.02 \times 10^{24}$ moles of $CO = 10$ moles of $CO$
$1$ mole of $CO$ contains $1 \,g$ atom of oxygen
$10$ moles of $CO$ contains $10\, g$ atoms of oxygen