gr11 chemistry class test

Mass of any atom can be expressed as the relative atomic mass in units of amu. Amu is the atomic mass unit which is 1/12 the mass of one carbon-12 atom. Thus, the mass of an atom in comparison to the carbon-12 atom is called relative atomic mass, amu or u is used as the unit. However, using mass of a single atom is not practical since atoms have so small masses. We rather use mass of a bunch of atoms which will be explained as mole.
Mass of any atom can be expressed as the relative atomic mass in units of amu. Amu is the atomic mass unit which is 1/12 the mass of one carbon-12 atom. Thus, the mass of an atom in comparison to the carbon-12 atom is called relative atomic mass, amu or u is used as the unit. However, using mass of a single atom is not practical since atoms have so small masses. We rather use mass of a bunch of atoms which will be explained as mole.