You are asked to make 12 moles of iron(Fe) from iron oxide and carbon monoxide. Fe2O3(s) + 3CO(g)→2Fe(l) + 3CO2(g) Approximately how many moles of iron oxide(Fe2O3) is used? 3 6 24 12

A) the enthralling of formation for pure element in its standard state is always positivehope 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.

B"hf and f-"  is the correct answer took the test on edgenuity and got it right