A 40.0 L steel tank at 300 K contains a ternary gas mixture whose component partial…
CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A 40.0 L steel tank at 300 K contains a ternary gas mixture whose component partial pressures are
P(O₂) = 3.00 atm, P(N₂) = 4.50 atm, P(He) = 2.50 atm.
The tank is fitted with a valve through which a portion of the helium escapes. After the leak, 25.0 % of the original helium molecules (by amount) have left the tank. Temperature and volume remain constant throughout.
(a) Calculate the initial total pressure in the tank.
(b) Determine the new partial pressure of helium after the leak.
(c) Find the new total pressure of the gas mixture.
(d) State whether the mole fraction of nitrogen in the tank increases, decreases, or remains the same after the leak, and justify your answer quantitatively.