How many atoms are present in 1 amu and 1 n g of hydroge?

One Atomic Mass unit (amu) is defined as one twelfth of the mass of a carbon-12 atom, which is approximately (1.66 \times 10^{-27}) kg. In 1 nanogram (ng) of hydrogen, which is (1 \times 10^{-9}) grams, there are roughly (5.56 \times 10^{15}) hydrogen atoms, since the molar mass of hydrogen is about 1 g/mol. Thus, 1 ng of hydrogen contains a significantly large number of atoms compared to the mass represented by 1 amu.