Concentration of 2 litre H2O2 solution is 5M. What mass of O2 is liberated on heating 200 ml of this solution.

Mass of H2O2 present in 200 ml solution  = 34 gm 2H2O2→2H2O +O268 gm of H2O2 gives 32 gm of O2 34 gm of  H2O2 gives 16 gm of O2