AP Chemistry
9.4 Thermodynamic and Kinetic Control
9.3 Gibbs Free Energy and Thermodynamic Favorability
A student investigates the oxidation of carbon monoxide in two sealed vessels at \(298\ \text{K}\). The vessels have the same volume and initially contain the same partial pressures of \(\text{CO(g)}\) and \(\text{O}_2\text{(g)}\). The reaction and its standard Gibbs free-energy change are shown below.
\(2\text{CO(g)}+\text{O}_2\text{(g)}\rightarrow 2\text{CO}_2\text{(g)}\qquad \Delta G^\circ_{\mathrm{rxn}}=-514\ \text{kJ/mol}_{\mathrm{rxn}}\)
Which statement best explains both the sign of \(\Delta G^\circ_{\mathrm{rxn}}\) and the difference between the results?
\(2\text{CO(g)}+\text{O}_2\text{(g)}\rightarrow 2\text{CO}_2\text{(g)}\qquad \Delta G^\circ_{\mathrm{rxn}}=-514\ \text{kJ/mol}_{\mathrm{rxn}}\)
| Surface in vessel | Percentage of \(\text{CO(g)}\) converted after \(30\ \text{min}\) |
|---|---|
| Uncoated ceramic | Less than \(1\%\) |
| Palladium-coated ceramic | Approximately \(70\%\) |
Which statement best explains both the sign of \(\Delta G^\circ_{\mathrm{rxn}}\) and the difference between the results?
Similar Questions
Tools for a 5
AP aligned mock tests to help you get a 5.
With grading, adaptive explanations, and more.
Find a Quiz
Find, solve, and grade every AP FRQ ever.
Find an FRQ
Stuck on AP Chemistry? Get unstuck with an AP specialist.1 to 1 tutors who know the exam inside out. Understand weeks of material in a single session.Book a SessionSee all our elite tutors
Learn AP Physics from scratch, quickly. This is the only course you'll need for the year.
A self-paced course with everything you need to get a 5. Trusted by over 15,000 students and 200+ schools. Learn fast, or we'll refund your purchase, backed by our 100% satisfaction guarantee.
Explore the Course