WILL GIVE BRAINLIEST!! if when electrolyzed water (2H2O->2H2+O2), the total bond energy of the reactants is 2000kJ and the total bond energy of the products is 934kJ what is the total energy of the reaction and is this an endothermic or exothermic reaction

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

Naoh + hbr -> nabr (salt) + h2o ca (oh)2 + 2hbr - - - > ca (br)2 + 2h2o