i havea doubt  in this equation which is likethis given below -

  • i) Iron react with steam to form the metal oxide and hydrogen.
  • 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)

 (1) why the there is Fe3O4 in the above equation  and why not Fe2O3

(2)kindely explain me how we came to this equation

(2)(a) What is the equation for the reaction of calcium and potassium in water?

 Calcium and potassium do not react with each other, but each decomposes water to make the relevant hydroxide with the release of hydrogen. Ca + 2H₂O → Ca(OH)₂ + H₂. 2K + 2H₂O → 2KOH + H₂.

Asked by aayushsoni7474 | 25th Apr, 2020, 12:26: PM

Expert Answer:

(1)
When iron reacts with steam, it forms metal oxides and hydrogen gas.
 
Iron reacts to form iron(II,III)  oxide [FeO+Fe2 O3 ] and H2  gas.
 
 
3 Fe left parenthesis straight s right parenthesis space plus space 4 straight H subscript 2 straight O left parenthesis straight g right parenthesis space rightwards arrow space Fe subscript 3 straight O subscript 4 left parenthesis straight s right parenthesis space plus space 4 straight H subscript 2 left parenthesis straight g right parenthesis

Where comma space Fe subscript 3 straight O subscript 4 space is space straight a space mix space of space FeO space plus space Fe subscript 2 straight O subscript 3
 
(2)

Sodium, potassium and calcium reacts with cold water to form hydroxide with the liberation of hydrogen gas.
2K  + 2H2O  →  2KOH  + H2
2Na  + 2H2O  →  2NaOH  + H2
Ca  + 2H2O  →  Ca(OH)2  + H2

Answered by Ramandeep | 27th Apr, 2020, 11:56: AM