What is the sign of `Delta G^(ө)` for spontaneous reaction?

Explanation

To determine the sign of ΔG° (Gibbs free energy change at standard conditions) for a spontaneous reaction, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Gibbs Free Energy Equation**:
The Gibbs free energy change (ΔG) for a reaction can be expressed as:
\[
ΔG = ΔH - TΔS
...