Final answer:
To find the number of moles of aluminum in 7.5 x 10²⁰ atoms of Al, you can use Avogadro's number and the molar mass of aluminum.
Step-by-step explanation:
To determine the number of moles of aluminum in 7.5 x 10²⁰ atoms of Al, we can use the Avogadro's number and the molar mass of aluminum. The molar mass of aluminum is 26.98 g/mol. We can set up a conversion factor:
1 mol Al = 6.022 x 10²³ atoms Al
Using this conversion factor, we can calculate the number of moles:
7.5 x 10²⁰ atoms Al x (1 mol Al / 6.022 x 10²³ atoms Al) = 1.245 x 10⁻³ moles of aluminum