Ignore the cross can I write H2 + O2 gives H2O as O2 + H2 + H2O why and why not Share with your friends Share 0 Kushal Kumar answered this Dear Student 2H2 + O2 → 2H2Oand O2 + 2H2 →2 H2OBoth of these reactions are correct. One can write any of the two Regards -1 View Full Answer