8. Hydrogen gas +nitrogen gas > Nitrogen trihydride

The chemical equation for the reaction between hydrogen gas and nitrogen gas to form nitrogen trihydride (ammonia) is:3H2 + N2 → 2NH3In this reaction, three molecules of hydrogen gas (H2) react with one molecule of nitrogen gas (N2) to produce two molecules of nitrogen trihydride (NH3). The reaction is reversible and can be represented by the following equilibrium equation:N2 + 3H2 ⇌ 2NH3The reaction is exothermic, meaning it releases heat. It is also a reversible reaction, meaning that the products can react with each other to form the reactants. The reaction is commonly carried out in a process called the Haber process, which involves high temperatures and pressures, as well as a catalyst to increase the rate of reaction.