PLEASE HELP ME WITH THIS ONE QUESTION

“ which structure below represents an atom of the same element?”

THERE IS A PHOTO ATTACHED

219 grams of iron (iii) oxide reacts with excess carbon according to the reaction equation shown below. fe2o3 + c → fe + co2 after a scientist performs the chemical reaction they find the actual yield of iron to be 57.4 grams. calculate the percent yield of this chemical reaction.

V1t2 = v2t1 is an expression of who’s law

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?