There are approximately 4.52 x 10^22 atoms of aluminum in 0.075 moles of the substance, calculated using Avogadro's number.
To determine the number of atoms in a given amount of substance, you can use Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol. This number represents the number of atoms, ions, or molecules in one mole of a substance.
Given that you have 0.075 moles of aluminum, you can calculate the number of aluminum atoms using Avogadro's number:
Number of atoms = Number of moles x Avogadro's number
Number of atoms = 0.075 moles x 6.022 x 10^23 atoms/mol
Number of atoms = 4.5165 x 10^22 atoms
So, there are approximately 4.52 x 10^22 atoms of aluminum in 0.075 moles of aluminum.