A rigid 1.0 L container initially at 25 °C contains dinitrogen tetroxide and nitrogen…
CHEMISTRY · Multi-part · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
A rigid 1.0 L container initially at 25 °C contains dinitrogen tetroxide and nitrogen dioxide at equilibrium according to the reaction
N₂O₄(g) ⇌ 2 NO₂(g) ΔH° = +57 kJ
The total pressure is kept constant throughout the experiment.
(a) Predict qualitatively how the equilibrium partial pressures of N₂O₄(g) and NO₂(g) will change when the temperature is increased from 25 °C to 40 °C. Justify your prediction.
(b) Indicate whether the value of Kₚ at 40 °C is greater than, less than, or equal to its value at 25 °C. Provide an explanation based on thermodynamic principles.