By decreasing the pressure the reaction will go to that direction where_________________?
Correct answer: B. volume increased
- A. volume is decreased
- B. volume increased
- C. heat absorbed
- D. no. of moles of specie decreased
Explanation
When pressure is decreased, a gaseous equilibrium shifts toward the side with more gas molecules because that side occupies a greater volume and partly offsets the pressure decrease. Thus the favoured direction is the one in which volume increases. Students may choose the side with fewer moles by reversing the pressure rule, but increased pressure, not decreased pressure, favours fewer gas 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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