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The total amount of energy needed to break the Cl-Cl bonds in 4 molecules of Cl2 can be calculated by multiplying the energy required to break one Cl-Cl bond by the number of Cl-Cl bonds present in 4 molecules of Cl2.
The energy required to break one Cl-Cl bond is given as 1,724 kJ/mol.
There are 2 Cl-Cl bonds in one molecule of Cl2, so in 4 molecules of Cl2, there would be a total of 8 Cl-Cl bonds.
Therefore, the total energy needed to break the Cl-Cl bonds in 4 molecules of Cl2 is:
1,724 kJ/mol * 8 = 13,792 kJ/mol.
Since none of the given options match this value, none of the provided answers are correct.