Final answer:
There are 3.587 moles of aluminum in 96.7 grams of Al, calculated by dividing the mass of the aluminum by its molar mass of 26.98 g/mol.
Step-by-step explanation:
To determine the number of moles of aluminum in 96.7 g of Al, we use the molar mass of aluminum. We know from our reference that the molar mass of aluminum is 26.98 g/mol, which allows us to convert grams to moles. The conversion formula we will use is:
Number of moles = Mass of the substance (g) / Molar mass of the substance (g/mol)
Substituing the given values into this formula:
Number of moles = 96.7 g / 26.98 g/mol = 3.587 moles of Al
This calculation tells us that there are 3.587 moles of aluminum present in 96.7 grams of the element, rounded to three decimal places to match the precision of the least precise measurement.