Question

AlBr3 + K2SO4 → KBr + Al2(SO4)3

Answer 1

Answer: D

Explanation:

Answer 2

On the left, you have

• 1 Al
• 3 Br
• 2 K
• 1 S
• 4 O

while on the right, you have

• 1 K
• 1 Br
• 2 Al
• 3 S
• 12 O

To get a balanced equation, you'll need 6 KBr on the right, which would require 2 AlBr3 and 3 K2SO4 on the left, so you end up with

$2\,\mathrm{AlBr}_3+3\,\mathrm K_2\mathrm{SO}_4\to6\,\mathrm{KBr}+\mathrm{Al}_2(\mathrm{SO}_4)_3$