Answer:
2,3,6,1
2,3,6,1
Explanation:
The unbalanced reaction expression is given as:
 AlBr₃   +   K₂SO₄  →   KBr  + Al₂(SO₄)₃
We need to balanced this reaction equation. Our approach is a mathematical method where we assign variable a,b,c and d as the coefficients.
 aAlBr₃   +   bK₂SO₄  →   cKBr  + dAl₂(SO₄)₃
Conserving Al;  a  = 2d
          Br:  3a  = c
          K:  2b = c
          S:  b  = 3d
          O:  4b  = 12d
Let a  = 1, c = 3, d  = [tex]\frac{1}{2}[/tex]  b  = [tex]\frac{3}{2}[/tex] Â
 Multiply through by 2 to give;
   a  = 2, b = 3, c = 6 and d  = 1
 2AlBr₃   +   3K₂SO₄  →   6KBr  + Al₂(SO₄)₃