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

Explanation

To find the equivalent weight of the metal in the oxide that contains 40% oxygen by weight, we can follow these steps:

### Step 1: Determine the mass of oxygen in the oxide
Assume the total mass of the metal oxide is 100 g. Since the oxide contains 40% oxygen by weight, the mass of oxygen in the oxide is:
\[ \text{Mass of Oxygen} = 40\% \text{ of } 100 \text{ g} = 40 \text{ g} \]

...