Two identical rigid flasks are kept at an absolute temperature of
CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
Two identical 1.0L rigid flasks are kept at an absolute temperature of 298K. Flask A contains 2.0g of molecular hydrogen (H2), whereas Flask B contains 32.0g of molecular oxygen (O2). Both gases are ideal. A debate arises over which flask is at the higher pressure.
(a) Calculate the ratio PA/PB of the absolute pressures in the two flasks.
(b) Explain, without additional numerical work, why comparing the masses alone is insufficient to predict the relative pressures, making explicit reference to particle count and molecular mass.