A sealed 8.0 L container at 190 K holds a gaseous mixture consisting of 0.50 mol…
CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A sealed 8.0 L container at 190 K holds a gaseous mixture consisting of 0.50 mol CO₂(g) and 0.50 mol He(g). The total pressure measured for the mixture is 3.4 atm.
(a) Calculate the total pressure that would be predicted for the mixture if both gases behaved ideally.
(b) Determine the percent deviation of the measured total pressure from the ideal total pressure for the mixture.
(c) Discuss which component of the mixture is primarily responsible for the deviation calculated in part (b). Support your answer by comparing the relative strengths of the intermolecular forces for CO₂(g) and He(g).
(d) Predict qualitatively how the total percent deviation would change if the He(g) were replaced with an equal amount (0.50 mol) of N₂(g) at the same temperature and volume. Provide a molecular-level justification.