When chlorine gas and hydrogen gas react to form hydrogen chloride, what will be the change of enthalpy of the reaction?

Explanation:

Reaction between chlorine and hydrogen gas will take place as follows.

Since, standard enthalpy of is 0 kJ/mol and is also 0 kJ/mol. is -92.30 kJ/mol.

Hence, change in enthalpy will be calculated as follows.

                                       = (-92.30 - 0) kJ/mol

                                       = -ve

Also, formation of bonds is taking place between both chlorine and hydrogen atoms. As a result, heat will be released during this process.

Thus, we can conclude that change in enthalpy will be negative.            

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