The atomic mass of one molecule of carbon dioxide (CO2) can be calculated by adding up the atomic masses of the constituent atoms.
Carbon (C) has an atomic mass of approximately 12.01 atomic mass units (AMU), and oxygen (O) has an atomic mass of approximately 16.00 AMU. Since there are two oxygen atoms in one molecule of carbon dioxide, we multiply the atomic mass of oxygen by 2.
Therefore, the atomic mass of one molecule of CO2 is:
(1 * atomic mass of carbon) + (2 * atomic mass of oxygen) = (1 * 12.01 AMU) + (2 * 16.00 AMU) = 12.01 AMU + 32.00 AMU = 44.01 atomic mass units (AMU)
So, the atomic mass of one molecule of carbon dioxide (CO2) is approximately 44.01 AMU.