The apparatus consists of three temperature jacketed 1-000 L bulbs connected by stopcocks- Bulb A contains a mixture of H 2 O g - CO 2 g - and N 2 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- CO 2 sublimes at -78- C- and N 2 boils at -196- C- 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 219 mm Hg- What does bulb A contain-A- CO 2- N 2B- N 2C- CO 2- N 2- W aterD- CO 2

The correct option is A CO_2 & N_2As the first stop cock is opened H_2O freezes amp; both bulbs contain only CO_2 & N_2. As the second stop cock is ...

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Byju's Answer

Standard XII

Chemistry

Avogadro's Law & Gay Lussac's Law

The apparatus...

Question

The apparatus consists of three temperature jacketed 1.000 L bulbs connected by stopcocks. Bulb A contains a mixture of $H_{2} O (g)$ , $C O_{2} (g)$ , and $N_{2} (g)$ at $25^{\circ} C$ and a total pressure of 564 mm Hg. Bulb B is empty and is held at a temperature of $- 70^{\circ} C$ . Bulb C is also empty and is held at a temperature of $- 190^{\circ} C$ . The stopcocks are closed, and the volume of the lines connecting the bulbs is zero. $C O_{2}$ sublimes at $- 78^{\circ} C$ , and $N_{2}$ boils at $- 196^{\circ} C$ .
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 219 mm Hg. What does bulb A contain?

C O_{2}

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C O_{2} & N_{2}

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N_{2}

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C O_{2}, N_{2} & W a t e r

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Solution

The correct option is B $C O_{2} & N_{2}$
As the first stop cock is opened $H_{2} O$ freezes & both bulbs contain only $C O_{2} & N_{2}$ . As the second stop cock is opened $C O_{2}$ freezes & the system contain only $N_{2}$ at this point applying PV = nRT
$^{n} N_{2} = \frac{P}{R} (\frac{1}{T_{1}} + \frac{1}{T_{2}} + \frac{1}{T_{3}})^{n} N_{2} = 0.011$
After first stop cock opening $n_{C O_{2}} +^{n} N_{2} = \frac{P}{R} (\frac{1}{T_{1}} + \frac{1}{T_{2}}) = 0.03 n_{C O_{2}} = 0.02$

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