To produce the same energy, it takes 1.6 times more coal (by volume) than oil. how many gallons of oil will give you the same amount of energy as 450 pounds of coal. assume that 1 pound of coal has a volume of 0.14 gallons.

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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.