Iron combines with oxygen to form rust. Given the chemical reaction, how many grams of rust would be produced if 3 grams of reactants were consumed? A) 0 grams B) 1 gram C) 3 grams D) 7 grams

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02-03-2018
Chemistry

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Iron combines with oxygen to form rust. Given the chemical reaction, how many grams of rust would be produced if 3 grams of reactants were consumed? A) 0 grams B) 1 gram C) 3 grams D) 7 grams

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mixter17 mixter17 · Answer 1 · 2018-10-27T03:36:46+02:00

Hello!

If 3 grams of reactants were consumed, then C) 3 grams of rust must be produced.

Why?

There are two possible chemical reactions between iron and oxygen to form rust:

2Fe + O₂ → 2FeO (Ferrous Oxide)
4Fe + 3O₂ → 2Fe₂O₃ (Ferric Oxide)

These two chemical reactions obey the Law of Conservation of Matter, which states that matter is conserved in a chemical reaction.

So, if there are 3 grams of reactants initially, and they react completely, then 3 grams of rust (either Ferrous Oxide or Ferric Oxide) must be produced for the reaction to obey the Law of Conservation of Matter.

Have a nice day!