Answers

2016-04-02T16:52:07+05:30
Law of conservation of mass stays that mass can neither be created nor be destroyed...so 
168gm[Fe]+72gm[H2O]=232gm[Fe3O4]+8 gm [h2]
240gm=240gm
hence...it is binded to the law of conservation of mass...

0
2016-04-02T16:53:03+05:30
Law of conservation of mass since 
  168 g fe + 72 g of H2O = 232 g of Fe3O4 + 8 g H2
    =240g
1 5 1
hi plz mark it as brainliest answer if you find it helpful.