The weight of one oxygen atom can be calculated by considering its atomic mass, which is the average mass of oxygen isotopes found in nature. The atomic mass of oxygen (O) is approximately 16 atomic mass units (amu) or 16 unified atomic mass units (u).
It's important to note that the atomic mass of 16 amu or u represents the average mass of oxygen atoms, taking into account the different isotopes of oxygen and their relative abundances. Oxygen has three naturally occurring isotopes: oxygen-16, oxygen-17, and oxygen-18. Oxygen-16 is the most abundant isotope, while oxygen-17 and oxygen-18 are present in smaller quantities.
The atomic mass of 16 amu or u signifies that, on average, an oxygen atom is about 16 times more massive than a hydrogen atom, with hydrogen having an atomic mass of approximately 1 amu or u.
Therefore, the weight of one oxygen atom is approximately 2.656 × 10^-26 kilograms (kg) or 2.656 × 10^-23 grams (g).