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The exothermic formation of ClF3 is represented by the equation: Cl2(g) + 3F2(g) ⇌ 2ClF3(g); ΔH = -329 kJ. Which of the following will increase the quantity of ClF3 in an equilibrium mixture of Cl2, F2 and ClF3 ?

1. Adding F2
2. Increasing the volume of the container
3. Removing Cl2
4. Increasing the temperature

Correct answer: Adding F2

Solution

Adding F2 shifts the equilibrium to the right according to Le Chatelier's principle, as the system responds to the increased concentration of reactants by producing more ClF3.

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