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_2Y`
C. `X_2Y_2`
D. `X_2Y_3`

Answer

D

Explanation

Relative number of atoms of X `=(75.8)/(75) = 1.01`
Relative number of atoms of Y `=(24.2)/(16)=1.51`
Ratio of atoms of X and Y `=1.01:1.51=2:3`
Hence the formula of the compound is `X_2Y_3.`