Hydrogen is used in the manufacture of ____ by the Haber's process.

Explanation

**Step-by-Step Solution:**

1. **Identify the Process**: The Haber process is a chemical reaction used to synthesize ammonia from nitrogen and hydrogen.

2. **Source of Reactants**:
- **Nitrogen**: Nitrogen is obtained from the air, which is composed of approximately 78% nitrogen.
- **Hydrogen**: Hydrogen is typically sourced from natural gas.

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