In this question, we have to determine how much energy must be absorbed in the bonds before the reaction begin, we have the reaction:
H2 + CO2 -> CH2O2
As we can see, we have the energy of each bond
H and H = 432 kJ/mol
C and O = 799 kJ/mol
Since we have 2 oxygens bonded to the carbon atom, we will have 799 * 2
Therefore the total energy before the reaction begin is:
432 + 799 * 2 = 2030 kJ, 2nd option
