What are the equivalent volumes of hydrogen, oxygen and nitrogen?

Explanation

To determine the equivalent volumes of hydrogen, oxygen, and nitrogen, we need to understand the concept of equivalent volume in gases. The equivalent volume is the volume occupied by one equivalent of a gas at standard temperature and pressure (STP), which is 0 degrees Celsius and 1 atmosphere pressure.

### Step-by-Step Solution:

1. **Understand the Concept of Equivalent Volume**:
- The equivalent volume of a gas is defined as the volume occupied by one equivalent of that gas at STP.

2. **Know the Standard Values**:
...