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For the equilibrium: 2BaO2(s) <=> 2BaO(s) + O2(g), delta H > 0. At equilibrium, the pressure of O2 can be increased by which of the following actions?

1. Increasing the mass of BaO2
2. Increasing the mass of BaO
3. Increasing the temperature at equilibrium
4. Increasing the mass of both BaO2 and BaO

Correct answer: Increasing the temperature at equilibrium

Solution

Both BaO2 and BaO are solids, so their amounts do not affect the equilibrium position or P(O2). Since delta H > 0 (endothermic), increasing temperature shifts equilibrium to the right (Le Chatelier), increasing Kp = P(O2).

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