With different number of moles of reactants and product, the volume of system:
Correct answer: B. Changes
- A. Remains unchanged
- B. Changes
- C. Decreases
- D. Increases
Explanation
Option B is correct since Avogadro's law states that under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules. So the volume of a gaseous system is related to the number of moles, and when the number of moles changes, the volume of the system changes. Option A is incorrect since the volume of the system does not remain unchanged with a change in the number of moles. Option C is incorrect since the volume of a system does not always decrease with different numbers of moles. Option D is incorrect since the volume of a system does not always increase with different numbers of moles.
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About Le Chatelier's Principle
Le Chatelier's principle predicts how an equilibrium responds when concentration, pressure or temperature changes. Questions apply it to reversible reactions, identify the direction of shift and distinguish genuine equilibrium changes from the effect of a catalyst, which changes the rate of reaching equilibrium but not its position.
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