Answer: The answer is 9.55 mol of Al
Explanation: To obtain the number of moles of a certain element given the number of atoms only, you have to divide it with Avogadro's number, 6.02 * 10^23 mol^-1
molAl= (5.75*10^24 Al atoms) * (1mol/6.02*10^23 Al atoms)
molAl=9.55mol