Question

Two elements, X (at. wt. 75) and Y (at. wt. 16) combine to give a compound having 75.8% of X. The formula of the compound is

(a) XY

(b) X₂Y

(c) X₂Y₂

 (d) X₂Y₃

Answer 1

Correct option is (d) X₂Y₃

Mole atoms of X = \(\frac{75.8}{75}\) = 1.01; 

Mole atoms of Y = \(\frac{100-75.8}{16}\)

\(=\frac{24.2}{16}\)

\(= 1.5\)

Ratio of mole atoms of X and Y = 1.01 : 1.5 = 2 : 3