The amount of oxygen in $3.6 \, \text{moles}$ of water is ............ $g$.

Which one of the following statements is incorrect?

If $10^{21}$ molecules are removed from $200 \, mg$ of $CO_2$,then the number of moles of $CO_2$ left is .....

What is the number of moles of oxygen atoms and the number of moles of $N$ atoms respectively present in one mole of thymine?

How many moles of nitrogen atoms are present in $8 \ g$ of ammonium nitrate (in $mol$)?

Assertion $(A)$: Equal moles of different substances contain the same number of constituent particles.
Reason $(R)$: Equal weights of different substances contain the same number of constituent particles.
The correct answer is