Question

An oxide of a metal contains $40\%$ oxygen by weight. What is the equivalent weight of the metal? Report your answer by dividing it by 2___ .

Answer 1

Oxide $\to$ 40g oxygen and 60g metal M

eq wt of Metal M $\to$ mass that reacts with 8g O (eq wt of O)

60g metal $\to$ 40g O(2.5 mol)

? g metal = 8g O (0.5 mol)

eq mass of metal $\to$ $\frac{60\times 8}{40}=12g/eq$

$\frac{12}{2}=6$