Question

Which best represents a balanced equation? Hint: Are the number of Hydrogen atoms on the reactant and product side the same? Are the number of Oxygen atoms on the reactant and product side the same?

HgO ---> Hg + O2

2Fe + O2 ---> Fe2O3

2H2 + O2 ---> 2H2O

Answer 1

Moved to Chemistry.

Like the problem suggests, check that both sides have the same number of atoms of each type.

For example, let’s walk through the first equation.

HgO ---> Hg + O2

Notice how there is only 1 oxygen atom on the left side but 2 on the right. So the first equation is ***not*** balanced.

Try using this same logic on the second and third equations until you find one that’s balanced.