Question

1. balance the following chemical equation and choose the correct answer below: al + cl₂ → alcl₃ o 2al+3cl₂ → 2alcl₃ o al+3cl₂ → alcl₃ o 4al+2cl₂ → 4alcl₃ o 3al+2cl₂ → 7alcl₃

Explanation:

Step1: Balance aluminum atoms

On the left - hand side of the equation \(Al + Cl_2
ightarrow AlCl_3\), we have 1 aluminum atom and on the right - hand side we have 1 aluminum atom in \(AlCl_3\). To balance aluminum, we can put a coefficient of 2 in front of \(Al\) on the left - hand side and a coefficient of 2 in front of \(AlCl_3\) on the right - hand side, getting \(2Al+Cl_2
ightarrow 2AlCl_3\).

Step2: Balance chlorine atoms

Now, on the left - hand side we have 2 chlorine atoms in \(Cl_2\) and on the right - hand side we have 6 chlorine atoms in \(2AlCl_3\). To balance chlorine, we put a coefficient of 3 in front of \(Cl_2\). The balanced equation is \(2Al + 3Cl_2
ightarrow 2AlCl_3\).

Answer:

D. \(2Al+3Cl_2
ightarrow 2AlCl_3\)