What mass (in grams) of octane, a component of gasoline, would you have to use in your car to produce 9.48 x 105 kj of energy?

Density and pressure

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.