Vapour density of a gas is $22$. What is its molecular mass?

The weight of $H_2SO_4$ in $150 \ mL$ of $N = 1/7$ solution is ........ $g$.

Chlorine has two naturally occurring isotopes,${}^{35}Cl$ and ${}^{37}Cl$. If the atomic mass of $Cl$ is $35.45$,the ratio of natural abundance of ${}^{35}Cl$ and ${}^{37}Cl$ is closest to (in $: 1$)

Complete reaction of $2.0 \, g$ of calcium (at. wt. $= 40$) with excess $HCl$ produces $1.125 \, L$ of $H_2$ gas. Complete reaction of the same quantity of another metal $M$ with excess $HCl$ produces $1.85 \, L$ of $H_2$ gas under identical conditions. The equivalent weight of $M$ is closest to

An element has three isotopes and their isotopic weights are $11, 12, 13$ units,and their percentage of occurrence in nature is $80 \%, 15 \%, 5 \%$ respectively. Then the average atomic weight of the element will be $:-$

The average molar mass of chlorine is $35.5 \ g \ mol^{-1}$. The ratio of $^{35}Cl$ to $^{37}Cl$ in naturally occurring chlorine is close to : (in $:1$)