How many molecules are there in 22.4 L of `H_(2)` at STP?

Explanation

To find the number of molecules in 22.4 L of hydrogen gas (H₂) at STP (Standard Temperature and Pressure), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Moles**:
At STP, one mole of any gas occupies a volume of 22.4 liters. This is a fundamental concept in chemistry related to the mole concept.

2. **Identify the Volume Given**:
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