Explain how the relative abundance of each hydrogen isotope affects hydrogren's average atomic mass.?

Answer 1

In calculating atomic mass, you must consider all isotopes of the element in their relative abundance. In the case of Hydrogen, there are 3 isotopes: protium (1 proton), deuterium (1 proton & 1 neutron), and tritium (1 proton & 2 neutrons). Each of these isotopes have different mass since their nucleus contains different numbers of protons and neutrons. The most abundant is the protium which is about 99.98%, then followed by deuterium which is 0.0026–0.0184%, and then tritium.