AP Chemistry
9.5 Free Energy and Equilibrium
9.3 Gibbs Free Energy and Thermodynamic Favorability
The dissociation of dinitrogen tetroxide gas is represented by the following equation:
\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\,\text{NO}_2\text{(g)} \quad \Delta G^ circ_{298} = +4.8\text{ kJ/mol}_{\text{rxn}} \]
At \(298\text{ K}\), the equilibrium constant \(K_p\) for the reaction is approximately \(0.14\). A rigid, evacuated reaction vessel at \(298\text{ K}\) is charged with \(\text{N}_2\text{O}_4\text{(g)}\) at a partial pressure of \(1.0\text{ atm}\) and \(\text{NO}_2\text{(g)}\) at a partial pressure of \(0.010\text{ atm}\).
Which of the following statements best describes the initial thermodynamic favorability of the forward reaction and provides the correct justification?
\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\,\text{NO}_2\text{(g)} \quad \Delta G^ circ_{298} = +4.8\text{ kJ/mol}_{\text{rxn}} \]
At \(298\text{ K}\), the equilibrium constant \(K_p\) for the reaction is approximately \(0.14\). A rigid, evacuated reaction vessel at \(298\text{ K}\) is charged with \(\text{N}_2\text{O}_4\text{(g)}\) at a partial pressure of \(1.0\text{ atm}\) and \(\text{NO}_2\text{(g)}\) at a partial pressure of \(0.010\text{ atm}\).
Which of the following statements best describes the initial thermodynamic favorability of the forward reaction and provides the correct justification?
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