The equivalent mass of an element $X$ is $9$. If the vapor density of its chloride salt is $66.75$,determine the valency of element $X$.

The atomic weight of $Ne$ is $20.2$. It is a mixture of $Ne^{20}$ and $Ne^{22}$. What is the relative abundance of the heavier isotope (in $\%$)?

The equivalent weight of a bivalent metal is $37.2$. The molecular weight of its chloride is

Which method is used to determine atomic mass accurately?

If the mass of an electron is halved,the mass of a proton is doubled,and the mass of a neutron is $3/4$ of its original mass,then what will be the new atomic mass of an $O^{16}$ atom?

$A$ bivalent metal has an equivalent mass of $32$. The molecular mass of the metal nitrate is