A rigid 5.00 L vessel at 400 K contains 2.0 mol He and 1.0 mol Ne
CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A rigid 5.00 L vessel at 400 K contains 2.0 mol He and 1.0 mol Ne, giving an initial total pressure of 3.60 atm. The vessel is fitted with a membrane that allows only helium atoms to escape. After exactly half of the helium has left the container and temperature remains constant, what is the new total pressure of the gas mixture?
(a) 3.0 atm
(b) 2.4 atm
(c) 1.8 atm
(d) 5.4 atm