What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20.°c to 35°c

Particle exchange energy though elastic collision , hope this .

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.