The molar mass of aluminum (Al) is approximately 26.98 g/mol.
To find the mass of 4.23 moles of aluminum, we can use the following formula:
mass = moles x molar mass
So,
mass = 4.23 moles x 26.98 g/mol = 114.1354 g
Therefore, the mass of 4.23 moles of aluminum is approximately 114.1354 grams.