What is the chemical equation for Aluminum metal reacts with hydrochloric acid to form hydrogen gas and an aluminum chloride solution

The key in the balancing of chemical reaction is to make sure that you got the exact chemical formula of the substance that is reacting and the yielded product. After getting the formula, identify first the hardest element/atom to be balanced such as Na, Zn, Cl, C, O, etc. Then proceed to the easier ones such as O, H. Make sure to note the atoms present in the molecule of the substance. In this, you have aluminum (most aluminum is solid at STP) reacts with hydrochloric acid HCl to form hydrogen gas, H2, and aluminum chloride, AlCl2. The balanced chemical equation is 2Al + 6HCl - > 3H2 + 2AlCl3.