Question

One atom of an element weighs $1.8\times 10^{-22}g$ . Its atomic mass is

• A. 29.9
• B. 154
• C. 108.36
• D. 18

Answer 1

Answer: (C)

Mass of 1 atom $=1.8\times 10^{-22}g$
Mass of $6.02\times 10^{23}$ atoms
$=6.02\times 10^{23}\times 18\times 10^{-22}g$
$=6.02\times 1.8\times 10g$
$=108.36g$
Hence, atomic mass of element $=108.36$.