Question

The equivalent weight of an element is 4. Its chloride has a vapour density 59.25. Then find the valency of element.

Answer 1

$$\begin{gathered} molecularmass=2\times Vapourdensity \\ Molecularmass=2\times 59.25=118.5 \\ Theformulaofthemetalchloride=MC{l}_n \\ MC{l}_n=118.5 \\ M+n\times Cl=118.5 \\ 4+n\times Cl=118.5 \\ n\times Cl=118.5-4=114.5 \\ n\times 35.5=114.5 \\ n=\frac{114.5}{35.5}=3.23\approx 3 \\ Thusthevalencyoftheelement=3 \end{gathered}$$