In the reaction $Ca(OH)_2 + H_3PO_4 \to CaHPO_4 + 2H_2O$,the equivalent weight of $H_3PO_4$ is:

Chlorine has two isotopes $^{37}Cl$ and $^{35}Cl$ with percentage abundance of $25\%$ and $75\%$ respectively. Find the average atomic mass of chlorine.

The element whose $1$ atom has a mass of $10.86 \times 10^{-26} \ kg$ is

What is the equivalent weight of methanol if one mole of $CH_3OH$ is combusted to form $CO$ and $H_2O$?

In the chemical scale,the relative atomic mass of the naturally occurring isotopic mixture of oxygen atoms $({}^{16}O, {}^{17}O, {}^{18}O)$ is taken as:

$5 \, mol$ of $AB_2$ weigh $125 \times 10^{-3} \, kg$ and $10 \, mol$ of $A_2B_2$ weigh $300 \times 10^{-3} \, kg$. The molar mass of $A$ $(M_A)$ and molar mass of $B$ $(M_B)$ in $kg \, mol^{-1}$ are: