Question

1. 4al₂(so₄)₃ al= s= o=

Explanation:

Step1: Determine the number of atoms of each element in one formula unit of $\ce{Al2(SO4)3}$

In $\ce{Al2(SO4)3}$, there are 2 Al atoms, 3 S atoms (since there is 1 S in $\ce{SO4}$ and 3 $\ce{SO4}$ groups), and 12 O atoms (4 O in each $\ce{SO4}$ group and 3 $\ce{SO4}$ groups: $4\times3 = 12$).

Step2: Multiply by the coefficient 4

For Al: $4\times2=8$
For S: $4\times3 = 12$
For O: $4\times12=48$

Answer:

Al = 8, S = 12, O = 48