Question

what happens when a mixture of hydrogen and chlorine is exposed to light​

Answer 1

Answer:

forms hydrochloric acid

Answer 2

Answer:

Exposure to sunlight initiates the reaction between chlorine and Hydrogen giving rise to hydrochloric acid. Thus, it is called photochemical reaction. 

overall reaction:

                        H²+Cl²→hv2HCl

Initiation:  

                         Cl²+hv→2Cl

Propagation: 

                         Cl+H²→HCl+H

                          H+Cl²→HCl+Cl

                     

Termination:        2H→H²

                           2Cl→Cl²

                            H+Cl→HCl

               

The enthalpy for the overall reaction is -184.6KJ/ 2mols of HCl. This reaction is catalyzed by the light(photochemical reaction) towards the violet end of the visible spectrum.

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