(1)①28.09 ②18 ③3;6 (2)Fe;CuSO 4
(3)①CaO+H 2O=Ca(OH) 2 ②CaCO 3+2HCl=CaCl 2+H 2O+CO 2↑ ③C 2H 5OH+3O 2
2CO 2+3H 2O
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