For an equilibrium change involving gaseous phase, the forward reaction is first order while the reverse reaction is second order. The unit of Kp for the forward equilibrium is:
Correct answer: A. atm
- A. atm
- B. atm2
- C. atm-1
- D. atm-2
Explanation
For a reaction where the forward reaction is first order and the reverse is second order, the equilibrium constant Kp for the forward reaction will have the unit of pressure raised to the power of the order of the forward reaction, which is atm. The units of Kp are derived from the partial pressures of the gases involved, and for a first-order reaction, the unit is simply atm. Other options such as atm2, atm-1, and atm-2 correspond to different reaction orders that do not match the given scenario.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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