Sorry, I’m not trying to fool around. I’m just confused, my Lab and Lecture are on two different parts. I know that the molar mass of Fe is 55.845g/mol that’s 55845mg and what’s that divided by 100mg/kg of iron? That’s how I got my answer. I didn’t think it was right because I know moles would be an extremely smaller number. Avogadro’s number. 6.022e23. We just haven’t learned this yet, so I’m a little confused and lost. I’m used to converting a mol of something into grams or the other way around. When balancing equations and doing stoichiometry.