Answer:
3.918 mol Al
Explanation:
To convert between moles and grams, you have to use the molar mass of the substance. The molar mass of aluminum is 26.98 g/mol. You use this as the unit converter.
[tex]105.7gAl *\frac{1molAl}{26.98gAl} =3.91771683molAl[/tex]
Round the number to the lowest number of significant figures; 3.918 mol Al
