X and Y are two compounds of elements A and Cl. Molar mass % of Cl Thus X and Y are

Let, X be AClx⇌A+xClY be ACly=A+yClMoles mass of x = 137% of Cl in X=35.5x137=77.5100x=3.0% of Cl in Y=35.5y208=85.1100∴ y=5Thus, x is ACl3 . Y is ACl5.