Viết các PTHH hoàn thành sơ đồ biến đổi sau a,Na--->Na2O--->NaOH--->Na2SO3--->Na2SO4--->BaSO4 b,S--->SO2--->SO3--->H2SO4--->K2SO4--->BaSO4 c,Fe--->FeCl2--->Fe(OH)2--->FeO--->Fe--->Fe2(SO4)3

2 câu trả lời

Đáp án: 

a, Na + O2 -> Na2O

    Na2O + H2O -> 2NaOH 

    2NaOH + H2SO3 -> Na2SO3 + 2H2O

    Na2SO3 + H2SO4( đặc)→ Na2SO4 + H2O + SO2

    Na2SO4 + Ba(NO3)2 -> NaNO3 + BaSO4

b,  S + O2 →SO2

     2 SO2 + O22 SO3

    SO3 + H2O -> H2SO4  

    H2SO4  + K2O -> K2SO4 + H2O

    K2SO4 + BaCl2 -> KCl + BaSO4

c, Fe + AgCl2 -> FeCl2 + Ag

   FeCl2 + Ba(OH)2 -> Fe(OH)2 + BaCl2

  Fe(OH)2 -> FeO + H2O

  FeO + H2 -> Fe + H2O

  2Fe + 6H2SO4( đặc)-> Fe2(SO4)3 + 3 SO2 + 6 H2O

Giải thích các bước giải:

 

Đáp án:

 

Giải thích các bước giải:

4Na + O2 -> 2Na2O

  Na2O + H2O -> 2NaOH

2NaOH  + SO2 -> Na2SO3 + 2H2O

Na2SO3+ H2SO4 -> Na2SO4 + SO2 + H2O

Na2SO4 + BaCl2 -> BaSO4 + 2NaCl

b

S + O2 -> SO2

2SO2 + O2 -> 2SO3

SO3 + H2O -> H2SO4

H2SO4 + 2KOH -> K2SO4 + 2H2O

Fe + 2HCL -> FeCL2 + H2

FeCl2 + Ba(OH)2 -> Fe(OH)2 + BaCl2

Fe(OH)2 -> FeO + H2O

FeO + H2 -> Fe + H2O

2Fe + 3H2SO4 -> Fe2(SO4)3 +3 H2

Chúc bn hc tốt nha ^.^

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