40 gm metal oxide (MO) contain 4 gm of Oxygen.Calculate the equivalent wt of a metal.

40 gm metal oxide contains 4 gm of Oxygen mean it has 36 gm of metal.

Then Equivalent wt of metal is 

  E_m = (Wt of metal/Wt of Oxygen)×8

  E_m = (36gm /4gm)×8

  E_m = 72 gm equivalent