Question

Why must coefficients be used when writing chemical equations

Answer 1

Here’s what a chemical equation looks like: Fe + O2 → Fe2O3.

hope it helps you

Answer 2

A coefficient is a number placed in front of a chemical symbol or formula. It shows how many atoms or molecules of the substance are involved in the reaction. For example, two molecules of hydrogen would be written as 2H2. A coefficient of 1 usually isn’t written.