Barium, it's an earthy alkaline metal it's atomic number is 56
You have already gotten the balanced equation. And the ratio of mol number of reactants and production is the ratio of coefficient. So there is 6.4/8*11=8.8 mol oxygen needed. The mass is 8.8*32=281.6 g.
Hypochlorous acid is a weak acid. The
value for the dissociation of HOCl is 
Potassium K
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