Question

The simplest formula of a compound containing 50% of an element $X$ (atomic mass = 10) and 50% of the element $Y$ (atomic mass = 20) is:

• A. $XY$
• B. $X_{2}Y$
• C. $X_2{Y}_2$
• D. $X_2{Y}_3$

Answer 1

The correct option is B $X_{2}Y$

Ans :B

Let mass of compound = 100 gm

Then mass of X = 50 gm

Then mass of Y = 50 gm

Mole of X = $\frac{50}{10}$ = 5

Mole of Y =$\frac{50}{20}$ = 2.5

Molecular formula = $X_5{Y}_{2.5}=X_{2}Y$