Question

In the equation, 2Al (s) + 3Cl2 (g) arrow 2AlCl3 (s), the large number '3' in front of the Cl2 indicates:
Answer

the number of chlorine atoms needed to balance the equation

the number of chloride molecules needed to balance the equation

the number of moles of chlorine atoms needed to balance the equation

the number of moles of chlorine molecules needed to balance the equation

Answer 1

(B) or (D)

Answer 2

Do you think perhaps you should post this in the chemistry section?

Answer 3

But since it is here, the answer is D