The mass and volume of $1/4$ mole of oxygen gas at $STP$ are respectively .....

Assertion : Equal moles of different substances contain same number of constituent particles.
Reason : Equal weights of different substances contain the same number of constituent particles.

The mass of $112 \ cm^3$ of $NH_3$ gas at $STP$ is (in $g$)

Three $1 \ L$ flasks contain $N_2$,$Ne$,and $O_3$ gases respectively. At the same temperature and pressure,find the ratio of the total number of atoms present.

Consider two sealed jars of equal volume. One contains $2 \ g$ of hydrogen at $200 \ K$ and the other contains $28 \ g$ of nitrogen at $400 \ K$. The gases in the two jars will have

Which of the following contains $6.02 \times 10^{22}$ molecules?