Question

The first part of a balanced equation is shown as 2AI + 6HCL. in order for this equation to be balanced how many hydrogen atoms must be present in the products.

Answer 1

This exercise is similar to the previous one and we can solve it by following the same steps. We have the number of molecules in the reagents:

2 Al

6HCl

The atoms of the molecules do not have subindexes*, therefore the total value will be equivalent to the coefficient multiplied by 1:

Al: 2 x 1 =2

H: 6 x 1 = 6

Cl: 6 x 1 = 6

So, must be present 6 atoms of hydrogen in the products

* Subindexes: "A letter or number placed to the right and at the bottom of a mathematical, chemical, etc. symbol to distinguish it from other similar symbols". For example:

$H_2O$

In this case, the subindex will be number two. It means that there are 2 hydrogens in the molecule.