15 g of BaO2 is heated to 794 C in a closed evacuated vessel of 5 litres capacity.How many grams of peroxide are converted to BaO(s)+2BaO2(s)--------> @BaO(s) + O2(g) ,Kp=0.5 atm

use the relation kp=kc(rt)power n . find kc

next step carry on the general eqn 2 bao2------->bao +o2

at t=0 bao2 is 1 mole  and bao is 0 and 02 is 0 

at equilibrium ba02 is 2- 2x because od 2 ba02

and bao is x and 02 is also x

now equate it to kc find x 

go for 2-2x as its the no of moles of 2bao2 present at equi

forgive me if i made a mistake i am only a class 9 student . like if i am right