HELP ASAP

The Delta. Hrxn of formation of carbon dioxide is negative. Which statement is true?
The reaction is endothermic.
The reaction is exothermic.
The amount of carbon dioxide is more than the amount of reactants.
The amount of carbon dioxide is less than the amount of reactants.

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.

257 grams h2o i think

Kim jong un.yeet jkany leaking in the power plant can directly cause radiation and other bio hazards.brainliest answer pls.