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Interpretation:
The total pressure for the given reaction after equilibrium is reestablished has to be calculated.
Concept Introduction:
Equilibrium constant
In gas phase reactions, partial pressure is used to write equilibrium equation than molar concentration. Equilibrium constant
Consider the reaction where A reacts to give B.
On rearranging,
Where,
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Explanation of Solution
Given:
The decomposition of Ammonium hydrogen sulfide takes place as follows,
Calculation of new partial pressures:
The equilibrium constant expression of the given reaction is,
Since
The partial pressure of
Calculate the equilibrium constant.
Determine the change in pressure and the new partial pressure for
Initial total pressure of the reaction is
Final total pressure after addition of
The change in pressure is,
The new partial pressure of
Construct ICE table for the reaction.
Initial | 0.574 | 0.332 | |
Change | +x | +x | |
Equilibrium | (0.574 + x) | (0.332 + x) |
Plug the equilibrium pressures from ICE table in equilibrium constant expression and solve for x.
Substitute ‘x’ in the equilibrium partial pressure of ICE table and solve for new partial pressures.
Therefore, the new equilibrium partial pressures of
The total pressure after equilibrium is re-established is,
Therefore, the total pressure after equilibrium is re-established is found as
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Chapter 19 Solutions
General Chemistry
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