When `20 g` of `CaCO_(3)` were put into `10 litre` flask and heated to `800^(@)C`, `35%` of `CaCO_(3)` remained unreacted at equilibrium. `K_(p)` for decomposition of `CaCO_(3)` is :

Explanation

Moles of `CaCO_3` initially present =`20/100`=0.20
Moles of `CaCO_3` left at equilibrium `=(0.20xx35)/100`
Moles of `CaCO_3` reacted =0.20 -0.07 =0.13
`{:(,CaCO_3 (s) hArr , CaO(s)+ , CO_2(g)),("Initial conc.", 0.20,0,0),("At equi.", 0.07,0.13,0.13):}`
Pressure of `CO_2, p =(nRT)/V`
`=(0.13xx0.0821xx1073)/10`=1.145
`K_p=p(CO_2)`=1.145 atm