Q.
Suppose the elements X and Y combine to form two compounds $XY_2$ and $X_3Y_2$. When 0.1 mole of $XY_2$ weighs 10 g and 0.05 mole of $X_3Y_2$ weighs 9 g, the atomic weights of X and Y are
A) 40, 30
B) 60, 40
C) 20, 30
D) 30, 20
Explanation
[Solution] X + 2Y = 100 and 3X + 2Y = 180, giving X = 40 and Y = 30. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.