The value of amu is which of the following is

amu represents atomic mass unit. It is used in place of unified mass unit.
1 amu = 1 avogram = 1 aston = 1 dalton
$1 \mathrm{amu}=\frac{1}{12}\times \text{ mass }=1\text{ aston }=1\text{ dalton }$
$=\frac{1}{12} \times 1.9924 \times {10}^{-23} \mathrm{g}$
$=1.66 \times {10}^{-24} \mathrm{g} = 1.66 \times {10}^{-27} \mathrm{kg}$