When 20 ml of 2.5M H2O2 aqueous soultion is decomposed the S.T.P. volume of oxygen obtained is

No.of moles of H2O2 (η)=0.05moles  0.05 moles of H2O2 solution → ?? ml of O2 = 5 x 112=560 ml 2ml of 2.5 H2O2 aqueous solution is on decomosition at STP produces 560 ml of O2.