Question

$1$ amu is equal to $1.66\times {10}^{-24}$ g.

• A. True
• B. False

Answer 1

The correct option is A True

The atomic mass unit (amu) is equal to $\frac{1}{12}$ of the mass of one atom of the carbon-12 isotope.

1 mole carbon-12 atoms weigh 12 g.

$6.022\times {10}^{-23}$ carbon -12 atoms weigh $12g$.

1 carbon-12 atom weighs $\frac{12}{6.022\times {10}^{-23}}g$

$\therefore 1amu=\frac{1}{12}\times$ mass of one C-12 atom $=\frac{1}{12}$ $\times \frac{12}{6.022\times {10}^{-23}}$ $=1.66\times {10}^{-24}g$ or $1.66\times {10}^{-27}kg$.