CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
Four 1.00 mol samples of the gases He, Ne, CO2, and SO2 are each sealed in identical rigid 8.00 L containers at 250 K. For which gas is the measured pressure expected to be most significantly lower than the value calculated from PV=nRT, and why?
(a) CO2, because its greater molar mass means lower molecular speed and therefore lower pressure than predicted.
(b) SO2, because its large molecular size greatly reduces the free volume available to the gas.
(c) SO2, because it experiences the strongest intermolecular attractions of the four gases.
(d) Ne, because its small atomic radius allows the atoms to approach closely and interact more strongly, reducing the pressure.