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}^{-24}}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 $
$=1.66 \times 10^{-24} g =1.66 \times 10^{-27} kg$