1. The problem statement, all variables and given/known data 1.02 grams of an unknown sample, that contains iron and some other things. Amount of iron is unknown, other substances are unknown. The concentration is 0.023 mg Fe/mL The question says find the mass of Fe (in mg) in the 1.02 gram sample. Exact question is: "The unknown iron solution in the 25 mL volumetric flask was the result of pipeting 3.00 mL from the 1000.00 mL flask which originally contained the entire dissolved sample. Use principles of dilution and concentration to find the mass in milligrams of iron present in the 1.00 liter volumetric flask. This is the amount present in the original dry sample." The concentration i gave was for the 25 mL 2. Relevant equations none. 3. The attempt at a solution I'm guessing i have to convert from the concentration, to molarity, and go to grams divide by molar mass, something like that. I think it will be something similar to that. I will update the attempt because its not really clear right now.