Chemistry - Ideal Gas Question with Solution | TestHub
A collapsed polyethylene bag of 30 l capacity is partially blown up by the addition of 10 l of H₂ at 0.9 atm at 298 K. Subsequently, enough O₂ is pumped into the bag so that at 298 K and external pressure of 1.35 atm the bag contains the full 30 l. The mixture is then sparked at 298 K so that the reaction 2H₂(g) + O₂(g) 2H₂O(l) goes to completion (vapour pressure of water at 298 K is negligible). If the final pressure of O₂ in the bag is x atm, then the value of 10x is
Answer:
Solution:
In the full 30 l bag at 298 K: P(H₂) = 0.9 × 10/30 = 0.3 atm; P(O₂) before sparking = 1.35 - 0.3 = 1.05 atm.
On sparking, H₂ is limiting: 0.3 atm of H₂ consumes 0.15 atm of O₂; the water formed is liquid (negligible vapour pressure).
P(O₂) remaining = 1.05 - 0.15 = 0.90 atm = x.
10x = 9.
