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$SO_{3}+H_{2}O=H_{2}SO_{4}$
$2NaOH+ZnCL_{2}=Zn(OH)_{2}+2NaCl$
$2Fe_{2}O_{3}+3H_{2}=4Fe+3H_{2}O$
$Ca_{3}(PO_{4})_{2}=3CaO+P_{2}O_{5}$

SO_{3} ->H_{2}SO_{4} ->ZnSO_{4} ->ZN(OH)_{2} ->ZnO" alt="2. SO_{2} -> SO_{3} ->H_{2}SO_{4} ->ZnSO_{4} ->ZN(OH)_{2} ->ZnO" align="absmiddle" class="latex-formula">
$1)2SO_{2}+O_{2}=2SO_{3}$
$2)SO_{3}+H_{2}O=H_{2}SO_{4}$
$3)H_{2}SO_{4}+ZnCl_{2}=ZnSO_{4}+2HCl$
$4)ZnSO_{4}+2NaOH=Zn(OH)_{2}+Na_{2}SO_{4}$
$5)Zn(OH)_{2}=ZnO+H_{2}O$