The discussion revolves around calculating the number of moles and atoms of iron (Fe) in a given mass of 400.0 grams. Participants explore the methodology for determining moles, significant figures, and the implications of atomic weight in the calculation.
Participants express uncertainty about the correctness of the initial calculation and the impact of significant figures. There is no consensus on the exact reason for the initial error, as multiple factors are suggested, including atomic weight and question phrasing.
Limitations include potential misunderstandings regarding significant figures and the specific atomic weight of iron used in calculations. The phrasing of the question may also introduce ambiguity.
This discussion may be useful for students working on chemistry problems related to stoichiometry, particularly those involving calculations of moles and significant figures.
Beats me. I would have said that's exactly what you're supposed to do. How do you know it's wrong? Were you given a different number as the solution?name_ask17 said:Ok. i attempted to find the number of moles by using 400/55.8 to get 7.17 but that is wrong?! please tell me ehy this is wrong. i set up a proportion like this 55.8g Fe = 1 mol
all over 400.0 grams =x and i solved for that x. i know its wrong, but why?
Maybe you should try a more accurate number for the atomic weight of iron. Also, what about the number of atoms question?name_ask17 said:well i know its wrong because my online homework is marking it wrong. I am really confused because i even tried changing the number to 4 sigfigs instead of 3 but it was wrong again. What am i doing wrong?!