An iron oxide is 77.7% in iron. Its empirical formula is ________.

Question

Quizplus · Accepted Answer

The empirical formula that corresponds to an iron oxide with 77.7% iron by mass is FeO. This is because the percentage of iron in FeO (by mass) closely matches the given percentage, considering that Fe has an atomic mass of approximately 56 and O has an atomic mass of 16, leading to a formula mass for FeO of 72. The percentage of Fe in FeO can be calculated as (56/72)*100%, which approximates the given value.

An Iron Oxide Is 77