找规律(用化学符号填空):2H3y)}4B8Z9_.B.E2\
(1)H2→)x(`,}-^/U7y)v'V/v3G'C6V →O2→Fe3O4→Fe;2H3y)}4B8Z9_.B.E2\
(2):?6c)r9R →Cl2→NaClO→KClO3→HClO4;2H3y)}4B8Z9_.B.E2\
(3)C2H4→C3H6→;E5D2T(Z0r6U1|(S8`:R(x'I,Y5D'Q →C5H102H3y)}4B8Z9_.B.E2\