Use bond energies to determine the energy transferred in the reaction between hydrogen and chlorine to make hydrogen chloride.

H2 (g) + Cl2 (g) → 2HCl (g)

(n*BE reactants)-(n*BE products) = BE rxn.

To determine the energy transferred in the reaction between hydrogen and chlorine to form hydrogen chloride using bond energies, you need to calculate the difference in bond energies between the reactants and the products.

1. Start by identifying the bonds broken and formed in the reaction:
- In H2 (g), there is a H-H bond.
- In Cl2 (g), there is a Cl-Cl bond.
- In 2HCl(g), there are two H-Cl bonds.

2. Look up the bond energies for each of the bonds involved. Bond energy is the energy required to break one mole of a particular bond in a gaseous molecule.

- The bond energy for H-H bond is approximately 432 kJ/mol.
- The bond energy for Cl-Cl bond is approximately 242 kJ/mol.
- The bond energy for H-Cl bond is approximately 432 kJ/mol.

3. Calculate the total energy needed to break the bonds in the reactants:
- For H2 (g), you have 1 H-H bond, so the energy required to break this bond is 432 kJ/mol.
- For Cl2 (g), you have 1 Cl-Cl bond, so the energy required to break this bond is 242 kJ/mol.

The total energy required to break the bonds in the reactants is 432 kJ/mol + 242 kJ/mol = 674 kJ/mol.

4. Calculate the total energy released when the bonds are formed in the products:
- For 2HCl(g), you have 2 H-Cl bonds. So, the energy released when these bonds are formed is 2 * 432 kJ/mol = 864 kJ/mol.

5. Calculate the energy transferred in the reaction:
- Since the energy released when the bonds are formed (864 kJ/mol) is greater than the energy required to break the bonds in the reactants (674 kJ/mol), the reaction is exothermic.

The energy transferred in the reaction between hydrogen and chlorine to form hydrogen chloride is the difference between the energy released and the energy required, which is:
864 kJ/mol - 674 kJ/mol = 190 kJ/mol.

Therefore, 190 kJ/mol of energy is transferred in the reaction between hydrogen and chlorine to make hydrogen chloride.