Which of the following is a synthesis reaction? c2h4 + 3o2 yields 2co2 + 2h2o 2hbr yields h2 + br2 co2 + h2o yields h2co3 f2 + 2 hcl yields cl2 + 2hf

Fecl3 + naoh → nacl + fe(oh)3 what are the coefficients that should be added to balance this equation? use complete sentences to explain your answer. explain how this chemical reaction demonstrates the conservation of mass.