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Write equations for the reactions of (i). iron with steam

(ii). calcium and potassium with water
  
(i). The equation for the reaction of iron with steam:
 
\(xFe(s) + yH_2O (g) → X + H_2(g)\)
 
Where, x, y and X, respectively are
(ii) The equation for the reaction of calcium and potassium with water:
 
\(Ca(s)+2H_2O (l) → Ca(OH)_2 (aq) + Y\)
 
Where Y is
\(2K(s)+2H_2O (l) → 2K(OH)(aq) + Z\)
Where Y is