For completely dissociated $NH_4Cl$,the vapour density is ........

At temperature $T$,a compound $AB_{2(g)}$ dissociates according to the reaction $2AB_{2(g)} \rightleftharpoons 2AB_{(g)} + B_{2(g)}$ with a degree of dissociation $x$,which is very small compared to unity. The value of $x$ is:

If the density of air at $STP$ is $0.001293 \, g \, mL^{-1}$,what will be its vapor density?

What is the vapour density of $O_2$ gas?

$A$ $1 \ L$ vessel contains $2 \ moles$ of $PCl_5$ initially. If $K_c$ is found to be $1$,the degree of dissociation of $PCl_5$ for the reaction $PCl_{5(g)} \rightleftharpoons PCl_{3(g)} + Cl_{2(g)}$ is:

If the vapor density of a volatile substance relative to $CH_4$ is $4$,then find the molecular mass of that substance.