Question

Explain how you would calculate the total change in bond energy for the reaction H2 + Cl2 -> 2HCI. How would you know if the
reaction was endothermic or exothermic? State your answer in 3-5 sentences.
2 points)

Answer 1

Answer:

 - 44 kcal

For the reaction : H2(g) + Cl2(g)→ 2HCl; Δ H = - 44 kcal .

Explanation:

Add together the bond energies for all the bonds in the reactants – this is the 'energy in'.

Add together the bond energies for all the bonds in the products – this is the 'energy out'.

Calculate the energy change = energy in – energy out.

Answer 2

The total change in bond energy of the reaction is calculated by subtracting the sum of energies of bonds broken from that of bonds formed.

• An exothermic reaction will have a negative value while an endothermic reaction will have a positive for total change in bond energy.

How to calculate total change in bond energy from bond energies

To calculate the total change in bond energy of a given reaction, the following formula is used:

• Total change in bond energy = sum of energies of broken bonds - sum of energies of bonds formed

After getting the total change in bond energy of the reaction, the value obtained will be used to predict if the reaction is exothermic or endothermic.

A negative value indicates an exothermic reaction.

A positive value indicates an endothermic reaction.

Therefore, total change in bond energy of the reaction is calculated by subtracting the sum of energies of bonds broken from that of bonds formed.

An exothermic reaction will have a negative value while an endothermic reaction will have a positive for total change in bond energy.

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