Q. $4.6 \times 10^{22}$ atoms of an element weigh 13.8 g. The atomic weight of element is
A) 290
B) 180
C) 34.4
D) 10.4
Explanation
(b)
$4.6 \times 10^{22}$ atoms weight =13.8 g
Hence, $6.02 \times 10^{23}$ atoms will weigh
$= \ \underset{4.6 \times 10^{22}}{\overset{13.8 \times 6.02 \times 10^{23}}{\rightarrow}}\ = 108.6\ g\ (molar\ mass)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.