Taking two examples of heterogeneously catalyzed reactions, explain how a heterogeneous catalyst helps in the reaction.

Explanation

To answer the question regarding how a heterogeneous catalyst helps in reactions, we will take two examples of heterogeneously catalyzed reactions and explain the role of the catalyst in each case.

### Step 1: Define Heterogeneous Catalysis
Heterogeneous catalysis occurs when the catalyst is in a different phase than the reactants. Typically, the catalyst is solid while the reactants are gases or liquids.

### Step 2: Example 1 - Haber Process
- **Reaction**: The Haber process synthesizes ammonia (NH3) from nitrogen (N2) and hydrogen (H2) gases.
- **Catalyst**: The catalyst used is iron (Fe), which is in a solid state.
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