The number of mole atoms and mole molecules in $56 \ L$ of oxygen gas at $STP$ are respectively:

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

$5.6 \, L$ of oxygen at $STP$ contains .............

The total number of electrons in $18 \ mL$ of water (density $= 1 \ g \ mL^{-1}$) is

If the number of moles of $CH_4$ is equal to the number of moles of $1.24 \, g$ of $SO_2$,then the weight of $CH_4$ will be ............ $g$.

What quantity of $H_2O$ in grams is present in $0.25 \text{ mol}$ of it (in $\text{ g}$)?