Question

what is the coefficient should be for a position w

Answer 1

$\text{ALBr}_3+K_2SO_4\rightarrow KBr+Al_2(SO_4)_3$$\begin{gathered} 2\text{AlBr}_3+3K_2SO_4\rightarrow6KBr+Al_2(SO_4)_3 \\ W=2 \\ X=3 \\ Y=6 \\ Z=1 \end{gathered}$