Question

The value of amu is which of the following?

• A. $1.57\times 10^{-24}kg$
• B. $1.66\times 10^{-124}kg$
• C. $1.99\times 10^{-23}kg$
• D. $1.66\times 10^{-27}kg$

Answer 1

Answer: (D)

amu represents atomic mass unit.
It is used in place of unified mass unit.
$1amu=1$ Avogram $=1$ Aston $=1$ Dalton
$1amu=\frac{1}{12}\times$ mass of $C-12$ atom
$=\frac{1}{12}\times 1.9924\times 10^{-23}g$
$=1.66\times 10^{-24}g$
$=1.66\times 10^{-27}kg$