0.2 g of oxygen and 3.17 g of a halogen combine separately with the same amount of a metal. What is the equivalent weight of the halogen?

Explanation

To find the equivalent weight of the halogen, we can follow these steps:

### Step 1: Understand the reactions
When the metal combines with oxygen, it forms a metal oxide (MO). When the metal combines with the halogen, it forms a metal halide (MX).

### Step 2: Write the equivalent weight relationship for oxygen
The equivalent weight of a substance is defined as the mass of the substance that combines with or displaces 1 mole of hydrogen or 8 grams of oxygen. For oxygen (O2), the equivalent weight is calculated as follows:
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