Question

Give two equations for exothermic reactions in which only elementary gases are involved.

Answer 1

Exothermic reaction: Exothermic reactions are those reactions in which energy is released in the form of light or heat or heat is transferred from the system to the surroundings.

Example of exothermic reactions:

• Formation of ammonia from hydrogen and nitrogen

$\underset{\mathrm{Nitrogen}}{\underset{}{{\mathrm{N}}_2\left(\mathrm{g}\right)}}+\underset{\mathrm{Hydrogen}}{\underset{}{3{\mathrm{H}}_2\left(\mathrm{g}\right)}}\to 2\underset{\mathrm{Ammonia}}{\underset{}{{\mathrm{NH}}_3\left(\mathrm{g}\right)}}$

• Formation of hydrogen chloride from hydrogen and chlorine

$\underset{\mathrm{Hydrogen}}{\underset{}{{\mathrm{H}}_2\left(\mathrm{g}\right)}}+\underset{\mathrm{Chlorine}}{\underset{}{{\mathrm{Cl}}_2\left(\mathrm{g}\right)}}\to \underset{\mathrm{Hydrogen}\mathrm{chloride}}{\underset{}{2\mathrm{HCl}\left(\mathrm{g}\right)}}$