What does 6HCl 2Al 2AlCl3 3H2 mean?

Answer 1

This is a chemical equation describing the reaction between hydrochloric acid and aluminum to form aluminum chloride and hydrogen gas.

Written with formatting, the chemical equation looks like:

6 HCl + 2 Al --> 2 AlCl3 + 3 H2

Answer 2

This chemical equation represents the reaction between hydrogen chloride and aluminum to form aluminum chloride and hydrogen gas. 6 moles of hydrogen chloride react with 2 moles of aluminum to produce 2 moles of aluminum chloride and 3 moles of hydrogen gas.