Engineering
Chemistry
Payload and Barometric Distribution of Pressure
Question
A open ended mercury manometer is used to measure the pressure exerted by a trapped gas as shown in the figure. Initially manometer shows no difference in mercury level in both columns as shown in figure.
After sparking A dissociates according to following reaction
A(g) → B(g) + 3C(g)
If pressure of Gas A decreases to 0.9 atm. Then
(Assume temperature to be constant and is 300 K)
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Solution
Given
Initial pressure of A gas is 1 atm
After sparking A dissociates into B and C
Pressure of A decreases to 0.9 atm
Solution
Let x be the decrease in Pressure of A
A(g) = B(g) + 3C(g)
t = 0 1 0 0
t = t 1-x x 3x
We know that
1 – x = 0.9
x = 0.1 atm
Total pressure of system at equilibrium is
= 1 – x + x + 3x
= 1.3 atm
The correct option is A
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