Chemistry - Ideal Gas Question with Solution | TestHub
The apparatus shown consists of three temperature jacketed 1.642 l bulbs connected by stopcocks. Bulb A contains a mixture of H₂O(g), CO₂(g) and N₂(g) at 27°C and a total pressure of 684 mm Hg. Bulb B is empty and held at -73°C. Bulb C is also empty and held at -193°C. The stopcocks are closed and the volume of the connecting lines is zero. CO₂ sublimes at -78°C and N₂ boils at -196°C. Neglect the volume of any solid, if formed.
Both stopcocks are opened and the system is again allowed to come to equilibrium. The pressure throughout the system is 0.036 atm. What do bulbs A, B and C contain?
Options:
Answer:
Solution:
At 80 K, CO₂ and H₂O are solid while N₂ (b.p. -196°C) stays gaseous in all three bulbs; CO₂(s) collects in the coldest bulb C, H₂O(s) in B and C. Check: n(N₂) = (0.036 × 1.642)/0.0821(1/300 + 1/200 + 1/80) = 0.72 × 0.020833 = 0.015 mol, consistent with Q17. Hence (d).
