Tolong bantu saya nomor 2

Mr L(OH)3 = Ar L + (3 x Ar O) + (3 x Ar H)
78 = Ar L + (3 x 16) + (3 x 1)
78 = Ar L + 48 + 3
78 = Ar L + 51
Ar L = 27

semoga membantu :)

Mr L (OH)3 = 78
L (OH)3 = (L × 1) + (16 × 3) + (1 × 3)
L (OH)3 = L × 1 + 51
L (OH)3 = 78 - 51 = 27