What is the mass in $kg$ of $5$ mole of acetic acid $(mol. mass = 60 \ g \ mol^{-1})$ (in $kg$)?

The number of moles present in $2 \ L$ of $0.5 \ M$ $NaOH$ is

In a sample of $CaCO_3$,there are $3.01 \times 10^{23}$ ions of $Ca^{+2}$ and an equal number of $CO_3^{-2}$ ions. The mass of the sample is = $......$ grams.

Containers $A, B$,and $C$ of equal volume contain oxygen,neon,and methane gases respectively at the same temperature and pressure. Which of the following is the correct order of their increasing mass?

What is the volume occupied by $1$ molecule of water, if its density is $1 \,g \,cm^{-3}$?

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