At 25 C, 1.00 mole of O2 gas was found to occupy a volume of 12.5 L at a pressure of 198 kPa. what is the value of the gas constant

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.

The answer is bhope this

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