Question

calculate the formula mass of aluminium 2 (S o4) 3​

Answer 1

Explanation:

Atomic mass = 2×27+3×(32+64)

= 342

Answer 2

Atomic mass of Al = 27 u

Atomic mass of S = 32 u

Atomic mass of O = 16 u

Formula unit mass of Al2(SO4)3 =

(2×27u)+(3×32u)+(12×16u)

= 54u + 96u + 192u

= 342u