[Big Baller]

The equilibrium constant Kp = 0.90 for the following reaction in the gas phase:
H2O(g) + Cl2O(g) 2HOCl(g).
Calculate the equilibrium pressure of HOCl in the reaction vessel if the initial pressures of H2O and Cl2O are both 0.50 atm.

   a.    ) 0.16 atm. 
   b.    ) 0.26 atm. 
   c.    ) 0.32 atm. 
   d.    ) 0.34 atm. 
   e.    ) 0.60 atm.