Calculate the partial pressure of CO when solid C, `Ca CO _(3) and Ca O` are mixed and allowed to attain equilibrium at the temperature for which the following equilibrium have been studied.
`Ca CO _(3) (s) hArr Ca O (s) + CO _(2) (g) , " " K _(p ) = 4. 0 xx 10 ^(-2) atm " "...(i)`
` C (s) + CO _(2) (g) hArr 2 CO (g), " " K _(P) = 2. 0 atm " "...(ii)`

Explanation

For equilibrium (i), `K_(p) = K_(CO_(2))` and for equilibrium (ii), `K_(p) = P_(CO)^(2)//P_(CO_(2))`
`K_(p)K._(p) = (P_(CO))^(2) = 8.0 xx 10^(-2) "atm"^(2) rArr P_(CO) = sqrt(8.0 xx 10^(-2) "atm"^(2)) = 0.28` atm