Question

according to the law of conservation of matter, the number of fe atoms needed to complete the following reaction is:?fe + 3o₂ → 2fe₂o₃ (1 point) 1 2 3 4

Explanation:

Step1: Analyze product side Fe atoms

On the right - hand side of the reaction $2Fe_2O_3$, the number of Fe atoms is $2\times2 = 4$.

Step2: Apply conservation of matter

According to the law of conservation of matter, the number of Fe atoms on the reactant side must equal the number on the product side. So the number of Fe atoms needed on the reactant side is 4.

Answer:

4