Two elemets `X(` atomic weight `=75)` and `Y(` atomic weight `=16)` combine to give a compound having `75.8%` X.` The formula of the compound is

Options

A. XY
B. `X_(2)Y`
C. `XY_(3)`
D. `X_(2)Y_(3)`

Answer

D

Explanation

Let 100 g mass of the compound
Moles of atoms of element `x = (75.8)/(75) square 1` , Moles of atoms of element `Y = (24.2)/(16) = 1.5`
So, formula of compound is `XY_(1.5)` or `X_(2)Y_(3)`