For the reaction c2h5oh + o2 --> 3co2 + 3h2o
delta h = -2434 kj/mol.

is this an exothermic or endothermic reaction?

The reaction given above is a combustion reaction. All combustion reactions are exothermic, meaning they give off heat when they react,

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.

0.50 hope this