Balance this equation underline ( )Al+underline ( )HClarrow underline ( )H_(2)+underline ( )AlCl_(3) 2,6,3,2 it is already balanced 1,2,3,4 1,4,6,1

To balance the chemical equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation.<br /><br />Given equation: $\underline {\quad }Al+\underline {\quad }HCl\rightarrow \underline {\quad }H_{2}+\underline {\quad }AlCl_{3}$<br /><br />Let's start by balancing the aluminum (Al) atoms. We have 1 Al atom on the left side and 1 Al atom on the right side. So, the coefficient for Al should be 1.<br /><br />Next, let's balance the chlorine (Cl) atoms. We have 1 Cl atom on the left side and 3 Cl atoms on the right side. To balance the Cl atoms, we need to have 3 HCl molecules on the left side.<br /><br />Now, let's balance the hydrogen (H) atoms. We have 3 H atoms on the left side and 2 H atoms on the right side. To balance the H atoms, we need to have 3 H2 molecules on the right side.<br /><br />So, the balanced equation is: $2Al+6HCl\rightarrow 3H_{2}+2AlCl_{3}$<br /><br />Therefore, the correct answer is: $2,6,3,2$.