3. 已知 6OH—+Br—→ BrO3 —+3H2O+6e— E° =–0.61V2OH —+Br—→ BrO—+H2O+2e — E° =–0.76V2OH —+Br—→ BrO—+H2O+2e — E° =–0.76V試求 4OH—+BrO —→ BrO3 —+2H2O+4e — 之 E° 值。(A) 0.15(B) 0.48(C)–0.15(D)–0.535(E)–1.37 V