Question

The Atomic mass of a metal m is 56. calculate the empirical formula of its oxide containing 70% metals. ​

Answer 1

Answer:

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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