CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
Three sealed, rigid steel tanks—labeled A, B, and C—are identical in shape and total internal volume. All three were filled with the same ideal gas on the same day and then sealed so that no gas can enter or leave. Before sealing, the following conditions were established:
• Tank A contains n moles of gas at 300 K.
• Tank B contains 2n moles of gas at 300 K.
• Tank C contains n moles of gas at 600 K.
Assume the gas continues to behave ideally after sealing.
(1) Rank the absolute (total) pressures in the three tanks from highest to lowest. Clearly justify your ranking without performing explicit numerical calculations.
(2) All three tanks are now placed together in a large oven that raises their temperatures by the same amount, 50 K. Without computing any final pressures, identify which tank experiences the greatest percent change in pressure and which experiences the smallest. Provide a concise but complete explanation for your choices.