So this type of reaction is called a balanced equation. Now, notice that what these coefficients represent is moles or molecules or atoms. But what they can't never represent is mass. So these numbers, these coefficients, in this case, one, one, one, in this case, one seven over two, two and three will never represent mass. So never kilograms, never grams, never pounds, never any type of mass. Only moles atoms or molecules.