Question

Aluminum metal reacts with hcl to form aluminum chloride and hydrogen gas. when this equation is balanced, the coefficient of hcl is ______.

Answer 1

This the chemical equation of the reaction of Al and HCl

Al + HCl → AlCl3 + H2 (g)

When you balance the atomos you get:

2Al + 6HCl → 2AlCl3 + 3H2 (g) ------- you can check that here you have the same number of atoms of Al, H, and Cl in both sides.

The coefficients are:

2 for Al, 6 for HCl, 2 for AlCl3 , and 3 for H2.

Then, the answer is: the coefficient of HCl is 6