Coefficients in a chemical formula provide

The relative number of products and reactants

Explanation:

The numerical coefficients in chemical equations show the ratio of the molecules of each substance involved in a chemical reaction that is both reactants and products. The coefficients in a balanced chemical equation indicate the relative number of moles of reactants and products.Additionally, coefficients are important to prove the law of conservation of mass.

The teacher is mostly talking about the distillation of a mixture

It could possibly be beneficial if the experiment is successful.