Question

The equivalent weight of a certain trivalent element is 20. molecular weight of its oxide is

Answer 1

Hiii
Ur answer is
equivalent weight is defined as the weight of an element which combines or replaces 
with 8 part of oxygen. 
so equivalent weight of trivalent is = 20 
so 20 gm of element combines with 8 gm of oxygen. 
formula is M2O3 = 2x+ 48 = molecular wt 
8 gm of O2 combines with = 20 gm of element 
48 gm of O2 will combines with = 20x48/8 = 120 
so moecular wt = 120 + 48 = 168 ans
Plz mark my brainlist

Answer 2

hloo frnd and your answer is as follows....

Atomic mass =Equivalent wt x valency
Mass of metal
m=20 x 3 =60
Hence oxide is 
M2O3
=(2 x 60)+(3x16)
=168


hope it may helps u...☺☺