The equivalent mass of a certain bivalent metal is $20$. The molecular mass of its anhydrous chloride is

Calculate the mass of $100$ molecules of oxygen $(O_2)$ in $amu$ and in grams.

Assuming chlorine element has two isotopes as $Cl^{35}$ and $Cl^{37}$ with their percentage abundance as $25\%$ and $75\%$ respectively. Find the average atomic weight.

In a reaction,the ferrous $(Fe^{2+})$ ion is oxidized to ferric $(Fe^{3+})$ ion. The equivalent weight of the ion in the above reaction is equal to:

What will be the equivalent weight of a metal if the vapour density of the chloride salt of a trivalent metal is $81.25$?

Elements $X$ and $Y$ form compounds $X_2Y_3$ and $X_3Y_4$ respectively. If $0.2 \ mol$ of $X_2Y_3$ weighs $32.0 \ g$ and $0.4 \ mol$ of $X_3Y_4$ weighs $92.8 \ g$,then the atomic masses of $X$ and $Y$ are respectively: