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mol = 30,1 x 10²²/6,02 x 10²³
mol = 0,5 mol
Mr = massa/mol
Mr = 80/0,5
Mr = 160
Mr L₂O₃ = 160
(2 x Ar L) + (3 x Ar O) = 160
2L + (3 x 16) = 160
2L + 48 = 160
2L = 112
L = 112/2
L = 56
Jadi, Al unsur L adalah 56