2h2o = 2h2+o2, how many moles of o2 will form when 1 mol of h2o reacts?

                                   2H2O = 2H2+O2
from reaction            2 mol               1 mol
from problem           1 mol              x mol

x=1*1/2= 0.5 mol O2 is formed when 1 mol of H2O reacts    
  

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o