The atomic mass of a metal m is 56

Asked by admin @ 20/08/2021 in Chemistry viewed by 318 People

assume that atomic weight of a metal 'M' to be 56,find the empirical formula of its oxide containing 70% of M

Answered by admin @ 20/08/2021

Atomic weight of metal M = 56
in an oxide, metal is 70% by mass and so oxygen is 30% by mass.
let there be n atoms of oxygen per 1 atom of metal.
Then proportion of the masses of metal and oxygen :
   56 : n * 16 = 70 : 30
   16 n = 56 * 30 / 70
   n = 24/16 = 1.5

There are two atoms of metal for 3 atoms of Oxygen.: M2 O3

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