Question

Calculate the atomic mass of $N$-atoms in unified atomic mass unit?

• A. 7 u
• B. 12 u
• C. 10 u
• D. 14 u

Answer 1

The correct option is D 14 u

Atomic mass of $N=(7+7)\times 1.66\times {10}^{-24}$ g
$=2.324\times {10}^{-23}$ g
$=2.324\times {10}^{-23}\times 6.022\times {10}^{23}u$
$\approx 14u$