9 . 112 The apparatus shown consists of three temperature-jacketed 1.000 L bulbs

Question

9.112 The apparatus shown consists of three temperature-jacketed 1.000 L bulbs connected by stopcocks. Bulb A contains a mixture of H2O(g), CO2(g), and N2(g) at 25 °C and a total

pressure of 564 mm Hg. Bulb B is empty and is held at a temperature of -70 °C. Bulb C is also empty and is held at a temperature of -190 °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.

(a) The stopcock between A and B is opened, and the sys- tem is allowed to come to equilibrium. The pressure in A and B is now 219 mm Hg. What do bulbs A and B contain?

(b) How many moles of H2O are in the system?

(c) Both stopcocks are opened, and the system is again allowed to come to equilibrium. The pressure through- out the system is 33.5 mm Hg. What do bulbs A, B, and

C contain?

(d) How many moles of N2 are in the system?

(e) How many moles of CO2 are in the system?

Explanation / Answer

(a) Bulb A contains CO2 (g) and N2 (g)

Bulb B contains CO2 (g) and N2 (g) and H2O (s).

(c) Bulb A contains N2 (g)

Bulb B contains N2 (g) and H2O (s)

Bulb C contains N2 (g) and CO2 (s)

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