This equation seems completely balanced to me. Let's figure out if this is true.
For an equation to be a balanced one, the quantity of atoms of each type must be the same on the left side and on the right side. Do not forget that an index under atom in a formula means that this molecule has
atoms of that type.
There are three types of atoms in our reaction:
and
Let's start from
There are oxygen atoms in
oxygen atoms in two molecules of
in
and
in two molecules of
So, we have
oxygen molecules at the left side and
at the right one. Balanced.
For we have
also true. For
true. As a whole, the equation is balanced.
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