Knowing that bleach contatins 5% aqueous sodium hypocholirte, how much sodium hypochlorite does 700ml of 10% bleach contain? (in grams)

Huh?

you mean that in a container it has 10 percent commercial bleach?

Then there is 70 ml of bleach in it, or 70 grams of bleach. 5 percent then is 3.5grams sodium hypochlorite.