Question

The value of amu is which of the following?

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

Answer 1

Answer: (B)

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 $C -12$ atm
$=\frac{1}{12} \times 1.9924 \times 10^{-23} \,g$
$=1.66 \times 10^{-24} \,g =1.66 \times 10^{-2} \,kg$