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 570 mm Hg. Bulb B is empty and held at a temperature of -73°C. Bulb C is also empty and is held at a temperature of -193°C. The stopcocks are closed and the volume of the lines connecting the bulbs is zero. CO2 sublimes at -78°C and N2 boils at -196°C. Neglect the volume of any solid, if formed.
The stopcock between A and B is opened and the system is allowed to come to equilibrium. The pressure in A and B is now 0.21 atm. What do bulbs A and B contain?
Options:
Answer:
Solution:
At -73°C, H2O freezes (m.p. 0°C) but CO2 (sublimes at -78°C) and N2 remain gaseous and fill both bulbs. Check: n(gas) = (PV)/R(1/TA + 1/TB) = (0.21 × 1.642)/0.0821(1/300 + 1/200) = 0.035 mol. Hence (c).
