#equilibrium problems

For A(g) + B(g) 2C(g) , Kp = 0.5 at 300 K. If the total pressure at equilibrium is 4 atm and PA = PB , what is PC ?

Let PA = PB = x , PC = 4 - 2x , Kp = ((PC)²/PA PB) = ((4 - 2x)²/x²) = 0.5 , 4 - 2x = x sqrt0.5 , x ≈ 1.37 , PC = 1.26 atm .

Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Acid-Base Theories - Arrhenius Bronsted-Lowry Lewis and Salts Hydrolysis