S SO2 -> SO3 -> H2SO4 -> SO2-> H2SO3 -> Na2SO3 b. Ca -> CaO-> Ca(OH)2 -> CaCO3 -> CaO -> CaCl2 Giúp mình với ạ,mình cảm ơn

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Dãy a)

$\text{1) S+O2$\xrightarrow{t^o}$SO2}$

$\text{2) 2SO2+O2$\xrightarrow[\text{V2O5}]{t^o}$2SO3}$

$\text{3) SO3+H2O$\rightarrow$H2SO4}$

$\text{4) Cu+2H2SO4(đặc)$\xrightarrow{t^o}$CuSO4+2H2O+SO2}$

$\text{5) SO2+H2O$\rightarrow$H2SO3}$

$\text{6) 2NaOH+H2SO3$\rightarrow$Na2SO3+2H2O}$

Dãy b)

$\text{1) 2Ca+O2$\rightarrow$2CaO}$

$\text{2) CaO+H2O$\rightarrow$Ca(OH)2}$

$\text{3) Ca(OH)2+CO2$\rightarrow$CaCO3↓+H2O}$
$\text{4) CaCO3$\xrightarrow{t^o}$CaO+CO2}$

$\text{5) CaO+2HCl$\rightarrow$CaCl2+H2O}$