Question

An oxide of a metal contains $40\%$ oxygen, by weight. What is the equivalent weight of the metals?

Answer 1

$\%$ of oxygen us metal oxide $=40\%$

Thus $\%$ of metal $=100-40=60\%$

Let us consider the mass of metal oxide to be $100g$

Eq wt of metal $=\frac{Massofmetal}{Massofoxygen}\times Eq.wt$ of oxygen

$\Rightarrow$ Eq. wt of metal $=\frac{60}{40}\times 8=12$

Thus Equivalent weight of metals is $12$.