The value of AG° at 25 °C for the decomposition of phosphorous trichloride into its constituer 2PC13 (g) P2 (g) 3C12 (g) is kJ/mol.

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Chapter1: Chemical Foundations
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**Question 3**

Use the table below to answer the questions that follow.

**Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C)**

| Substance   | ΔH°f (kJ/mol) | ΔG°f (kJ/mol) | S (J/K·mol) |
|-------------|---------------|---------------|-------------|
| **Calcium** |               |               |             |
| Ca (s)      | 0             | 0             | 41.4        |
| CaCl2 (s)   | -795.8        | -748.1        | 104.6       |
| Ca²⁺ (aq)   | 226.7         | 209.2         | 200.8       |
| **Chlorine**|               |               |             |
| Cl₂ (g)     | 0             | 0             | 222.96      |
| Cl⁻ (aq)    | -167.2        | -131.2        | 56.5        |
| **Oxygen**  |               |               |             |
| O₂ (g)      | 0             | 0             | 205.0       |
| H₂O (l)     | -285.83       | -237.13       | 69.91       |
| **Phosphorus**|             |               |             |
| P₂ (g)      | 144.3         | 103.3         | 210.1       |
| PCl₃ (g)    | -288.1        | -269.6        | 311.7       |
| POCl₃ (g)   | -542.2        | -502.5        | 325         |
| **Sulfur**  |               |               |             |
| S (s, rhombic) | 0          | 0             | 31.88       |
| S₂ (g)      | -269.9        | -300.4        | 248.5       |
| SO₃ (g)     | -395.2        | -370.4        | 256.2       |

The value of ΔG° at 25 °C for the decomposition of phosphorous trichloride into its constituent elements,
Transcribed Image Text:**Question 3** Use the table below to answer the questions that follow. **Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C)** | Substance | ΔH°f (kJ/mol) | ΔG°f (kJ/mol) | S (J/K·mol) | |-------------|---------------|---------------|-------------| | **Calcium** | | | | | Ca (s) | 0 | 0 | 41.4 | | CaCl2 (s) | -795.8 | -748.1 | 104.6 | | Ca²⁺ (aq) | 226.7 | 209.2 | 200.8 | | **Chlorine**| | | | | Cl₂ (g) | 0 | 0 | 222.96 | | Cl⁻ (aq) | -167.2 | -131.2 | 56.5 | | **Oxygen** | | | | | O₂ (g) | 0 | 0 | 205.0 | | H₂O (l) | -285.83 | -237.13 | 69.91 | | **Phosphorus**| | | | | P₂ (g) | 144.3 | 103.3 | 210.1 | | PCl₃ (g) | -288.1 | -269.6 | 311.7 | | POCl₃ (g) | -542.2 | -502.5 | 325 | | **Sulfur** | | | | | S (s, rhombic) | 0 | 0 | 31.88 | | S₂ (g) | -269.9 | -300.4 | 248.5 | | SO₃ (g) | -395.2 | -370.4 | 256.2 | The value of ΔG° at 25 °C for the decomposition of phosphorous trichloride into its constituent elements,
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