The atomic mass of aluminum (Al) is approximately 26.98 amu. Therefore, the mass of one Al atom is 26.98 amu.
To calculate the mass of 75 Al atoms, we can multiply the mass of one Al atom by 75:
Mass of 75 Al atoms = 75 atoms x 26.98 amu/atom
Mass of 75 Al atoms = 2024.5 amu
Therefore, the mass of 75 Al atoms is 2024.5 amu.