What do the coefficients of a balanced equation represent

Coefficients of a balanced equation represent the amount of moles, that has each reactant and the products that are made

Explanation:

In the reaction:

2H₂ (g) + O₂ (g) → 2H₂O (g)

2 moles of hydrogen react with 1 mol of oxygen to produce 2 moles of water.

If there is no coefficient, you assume a value of 1.

You can also say, 1 mol of oxygen reacts with 2 moles of hydrogen to produce 2 moles of water.