Out of C and CO, which is a better reducing agent at 673K?

Explanation

To determine which is a better reducing agent between carbon (C) and carbon monoxide (CO) at 673 K, we can analyze the situation using the concept of Gibbs free energy (ΔG) and the Ellingham diagram.

### Step-by-Step Solution:

1. **Understanding Reducing Agents**:
A reducing agent is a substance that donates electrons in a chemical reaction and gets oxidized in the process. The effectiveness of a reducing agent can be assessed by its Gibbs free energy change (ΔG) during the reaction.

2. **Ellingham Diagram**:
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