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.
$1\, amu =1$ Avogram $=1$ Aston $=1$ Dalton
$1\, amu =\frac{1}{12} \times$ mass of $C -12$ atom
$=\frac{1}{12} \times 1.9924 \times 10^{-23} g$
$=1.66 \times 10^{-24} g$
$=1.66 \times 10^{-27} kg$