There are two atoms of hydrogen on the reactant side of the equation.
What is a reaction?
What we try to show on paper are the changes that substances can undergo. A reaction is said to occur when two or more substances are combined together. The combination of the substances would now lead to the rearrangement of bonds and then the formation of a new product.
We know that it is one of the rules of writing a balanced chemical reaction equation that the number of the atoms of each element on the reactant side must be the same as the number of atoms of the same element on the products side.
When we look at the reaction as shown, we can see that the reaction is balanced hence we can be able to find the number of atoms of hydrogen on the reactants side by doing an atom count.
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