AP Chemistry
9.3 Gibbs Free Energy and Thermodynamic Favorability
A student investigates the gas-phase decomposition of nitrosyl chloride, \(\text{NOCl}(g)\), represented by the balanced equation below.
\[ 2\,\text{NOCl}(g) \rightleftharpoons 2\,\text{NO}(g) + \text{Cl}_2(g) \]
Thermodynamic data at \(298\text{ K}\) for the species in the reaction are given in the following table.
Based on the data in the table, what is the value of \(\Delta G^\circ\) for the reaction at \(298\text{ K}\)?
\[ 2\,\text{NOCl}(g) \rightleftharpoons 2\,\text{NO}(g) + \text{Cl}_2(g) \]
Thermodynamic data at \(298\text{ K}\) for the species in the reaction are given in the following table.
| Substance | \(\Delta G_f^\circ\ (\text{kJ/mol})\) |
|---|---|
| \(\text{NOCl}(g)\) | \(+66\) |
| \(\text{NO}(g)\) | \(+87\) |
| \(\text{Cl}_2(g)\) | \(0\) |
Based on the data in the table, what is the value of \(\Delta G^\circ\) for the reaction at \(298\text{ K}\)?
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