配平下列化学方程式(化学计量数为1也要填入“ ”内)
(1)________Fe＋________Cl₂________FeCl₃
(2)______WO₃+______H₂_____W+_____H₂O
(3)_______C₂H₅OH+______O₂______CO₂+______H₂O
(4)_______Fe₂O₃+_______CO_____Fe+_______CO₂
(5)________FeS₂+_______O₂_______Fe₂O₃+_______SO₂   
(6)________Al +________ Fe₃O₄________Fe +________ Al₂O₃
(7)_______Fe(OH)₃ +_______H₂SO₄ ═ _______Fe₂(SO₄)₃+ _______ H₂O