First slide

Gaseous state

Question

A manometer contains a liquid of density 5.44 g/cm is attached to a flask containing gas 'A as follows

Moderate

Question

If the same liquid is used in barometer to measure the atmospheric pressure, then what will be the length of the liquid column, which exerts pressure equal to 1 atm ? (density of Hg = 13.6 g/cm³)

A

190 cm
B

76 cm
C

30.4 cm
D

266 cm

Solution

$\begin{array}{l} h_{L} d_{L} = h_{Hg} d_{Hg} \\ h_{L} = \frac{76 \times 13 .6}{5 .44} = 190 cm \end{array}$

Question

The initial pressure of gas A in the flask is:

A

1.5 atm
B

1 atm
C

1.3 atm
D

1.2 atm

Solution

$P_{Gas} = P_{Atm} + P_{L} = 1 + \frac{38}{190} = 1 .2$

Question

If gas A undergoes 30% trimerization $[3 A (g) ⇌ A_{3} (g)]$ then the difference in height of the liquid level in two columns is:

A

38 cm
B

7.6 cm
C

3.04 cm
D

15.1 cm

Solution

$\begin{array}{l} 3 A (g) \underset{}{⇌} A_{3} g \\ t = 0 1 .2 atm A_{3} (g) \\ t = t_{eq .} 1 .2 - 0 .36 \frac{1}{3} (0 .36) = 0 .12 atm \\ ∴ P_{T} = 1 .2 - 0 .36 + 0 .12 = 0 .96 atm \\ ∴ The difference in height of the liquid level in two \\ columns = 0.04 \times 190=7.6 cm \end{array}$

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