Question

__ H2O + ___02 → _H2O2

Answer 1

2H2O + 1O2 → 2H2O2

Step-by-step explanation:

by semiractions:

(1) 2 H2O → H2O2 + 2H+

(2) 2H+ + O2 → H2O2

(1) + (2):

⇒ 2H2O + O2 → 2H2O2

4 - O - 4

4 - H - 4