What is the absolute mass of hydrogen, helium, lithium, boron, carbon, nitrogen, oxygen, florine, neon ?
For all practical purpose the absolute mass for any element is the atomic mass of the element, which is “how many times” an atom weighs compared to 1/12 of C-12 atom (i.e.amu). Now, as it is very much difficult to precisely define weight of a Kg (you define it with weight of water of known density for 1000 ml), similarly to calculate the absolute mass is a cumbersome process and not relevant. So atomic mass unit has been devised and utilised to specify atomic weight. e.g. Nitrogen (atomic mass = 14.00674 amu) which means that 1 mole of Nitrogen (6.023 * 10 raised 23) will weigh 14.00674 gms. Hydrogen -1.00794 Helium – 4.002602 similarly simply google any element to find the atomic mass (practically absolute mass)…. and enjoy the world of chemistry.
