Rust Has the Formula Fe₂O₃,and It's Made from Iron Metal

question 18

Multiple Choice

Rust has the formula Fe₂O₃,and it's made from iron metal reacting with oxygen over time.Assume that you had a 2.0-g block of pure iron metal that fully oxidized to rust and the mass of that product was 6.5 g.What must have been the mass of oxygen that initially reacted with pure iron?

• A) 2.0 g
• B) 6.5 g
• C) 4.5 g
• D) 4.0 g

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