Here's how to calculate the number of moles in 5.39g of aluminum:

1. Find the molar mass of aluminum:

* The molar mass of aluminum (Al) is 26.98 g/mol. This means one mole of aluminum weighs 26.98 grams.

2. Use the formula:

* moles = mass / molar mass

3. Plug in the values:

* moles = 5.39 g / 26.98 g/mol

* moles ≈ 0.200 mol

Therefore, there are approximately 0.200 moles of aluminum in 5.39 grams.