$x_1 \, g$ of a compound combines with $O_2$ to give $x_2 \, g$ of oxide. The equivalent mass of the compound is .........

The equivalent mass of an element is $4$ and the vapor density of its chloride is $59.25$. Find the valency of the element.

Elements $A$ and $B$ form two compounds $B_2A_3$ and $B_2A$. $0.05$ moles of $B_2A_3$ weigh $9.0 \ g$ and $0.10$ mole of $B_2A$ weigh $10 \ g$. The atomic weights of $A$ and $B$ are:

An alloy of metals $X$ and $Y$ weighs $12 \ g$ and contains atoms $X$ and $Y$ in the ratio of $2:5$. The percentage of metal $X$ in the alloy is $20$ by mass. If the atomic mass of $X$ is $40$,what is the atomic mass of metal $Y$ (in $amu$)?

$10 \text{ g}$ of a metal $(M)$ reacts with oxygen to form $11.6 \text{ g}$ of oxide. What is the equivalent weight of $M$?

The atomic mass of an element is $27$. If its valency is $3$,what is the vapor density of its volatile chloride?