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For the reaction CH4(g) + 2O2(g) ⇌ CO2(g) + 2H2O(l), ΔH = -170.8 kJ mol⁻¹ Which of the following statements is not true?

1. The equilibrium constant for the reaction is given by KP = [CO2] / [CH4][O2]²
2. Addition of CH4(g) or O2(g) at equilibrium will cause a shift to the right
3. The reaction is exothermic
4. At equilibrium, the concentrations of CO2(g) and H2O(l) are not equal

Correct answer: The equilibrium constant for the reaction is given by KP = [CO2] / [CH4][O2]²

Solution

The equilibrium constant expression for the given reaction should include only gaseous species. Since H2O is in the liquid state, it is not included in the expression. Thus, option A is incorrect.

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