Solid carbon is in equilibrium with a gas mixture: C(s) + CO2(g) 2CO(g). The total pressure is 2.0 atm and the mole fraction of CO in the gas phase is 0.40. K_p (in atm) is

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Solid carbon is in equilibrium with a gas mixture: $C (s) + CO X_{2} (g) 2 CO (g)$ . The total pressure is 2.0 atm and the mole fraction of $CO$ in the gas phase is 0.40. $K_{p}$ (in atm) is

p_{CO} = 0.40 \times 2.0 = 0.80

atm and

p_{CO X_{2}} = 0.60 \times 2.0 = 1.20

atm (solid carbon contributes nothing).

K_{p} = p_{CO}^{2} / p_{CO X_{2}} = 0.64/1.20 = 0.53

atm.