Answer/explanation :
N2 + 3H2 ---------> 2NH3
The reactant is N2 + 3H2(both are gases)
The product is 2NH3
This kind of reaction is called an equilibrium. It can also be affected by temperature and pressure.
What are reactants??
reactants are substances that are present at the start in a chemical reaction and are consumed during the reaction to make products.
Note: in every chemical reaction, there is always a reactant and a product, it can a combination of a gas, solid or liquid.