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SO4(-2) 4是下標 -2是上標 O化合價是-2 S是正6
生石灰是CaO熟石灰是Ca(OH)2石灰石主要成分是CaCO3 CaO+H2O=Ca(OH)2 Ca(OH)2+CO2=CaCO3+H2O CaCO3=CaO+CO2反應條件是高溫
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