534ChemistryMedium
A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?
A74% Fe
B77% Fe
C78% Fe
D75% Fe
Correct answer
C. 78% Fe
Explanation
78% Fe is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.