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)

108.36

Answer 2

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