It is found that, the actual atomic mass of a carbon-12 atom is equal to `1.9926 xx 10^(-23)`g. The atomic mass of oxygen is 16u, this means one atom of oxygen is 16 times heavier than 1/12 thof carbon atom. This means one hydrogen atom is 1 times heavier than 1/12 th of the carbon atom.

In this experiment you determine the atomic mass of magnesium. In terms of percent we can say that 1 g out. ‘amu’ is the abbreviation of Atomic mass unit, but now it is denoted just by ‘u’. The mass ratio of hydrogen to oxygen is 1/8. Thus atomic mass is the relative atomic mass of an atom with respect to 1/12 th of the mass of carbon-12 atom. This means atomic mass unit = 1/12th of carbon-12Ĭhapter List Matter Mixture Atoms-molecule structure of Atoms Cell Tissue Living Organism Motion Force & Law of motion Gravitation Work & Energy Sound Health Disease NaturalResources Food Production One atomic mass = 1/12 of the mass of one atom of C-12. Oxygen was isolated by Michael Sendivogius before 1604, but it is generally believed that the element was discovered independently by Carl Wilhelm Scheele in the laboratory in 1773 or earlier, and in 1774. The complete form of AMU is the atomic mass unit. What is the relative atomic mass of carbon The relative atomic. Thus for convenience relative atomic mass is used.Ĭarbon-12 is considered as unit to calculate atomic mass. Atomic Relative Mass is 51.996 Why elements have an average atomic mass It allows for the relative abundances of different isotopes. The atomic mass of oxygen is 16 u represents that the atomic mass of oxygen is 16 × 1 12 of the mass of carbon - 12 atom. To deal with such small nuber is very difficult. The relative atomic mass of an element is defined as the weight in grams of the number of atoms of the element contained in 12.00 g of carbon-12 One atomic mass unit is 1 12 t h of the mass of one atom of carbon-12. For example the actual mass of one atom of hydrogen is equal to 1.673 x 10 -24 g. The average atomic mass of oxygen is 22.99 amu because of the varying isotopes of sodium. Since, atoms are very small consequently actual mass of an atom is very small.

Atomic mass of oxygen