36. when the equation $\text{fe}_3\text{o}_4 + \text{al} \
ightarrow \text{al}_2\text{o}_3 + \text{fe}$ is correctly balanced, what is the coefficient of $\text{fe}$?

a) 3
b) 4
c) 6
d) 9

Question

36. when the equation $\text{fe}_3\text{o}_4 + \text{al} \
ightarrow \text{al}_2\text{o}_3 + \text{fe}$ is correctly balanced, what is the coefficient of $\text{fe}$?

a) 3
b) 4
c) 6
d) 9

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "multiple_choice_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "Balancing Chemical Equations" ], "new_concepts": [], "current_concepts": [ "Balancing Chemical Equations" ] } ## Balance oxygen atoms $$ \begin{aligned} &\text{Reactant: } \text{Fe}_3\text{O}_4 \quad (4 \text{ O atoms})\ &\text{Product: } \text{Al}_2\text{O}_3 \quad (3 \text{ O atoms})\ &\text{LCM of 4 and 3 is 12.}\ &3\text{Fe}_3\text{O}_4 + \text{Al} ightarrow 4\text{Al}_2\text{O}_3 + \text{Fe} \end{aligned} $$ ## Balance aluminum and iron atoms $$ \begin{aligned} &\text{Reactant Fe: } 3 \times 3 = 9 \text{ atoms}\ &\text{Product Al: } 4 \times 2 = 8 \text{ atoms}\ &3\text{Fe}_3\text{O}_4 + 8\text{Al} ightarrow 4\text{Al}_2\text{O}_3 + 9\text{Fe} \end{aligned} $$ ## Identify the coefficient of Fe $$ \begin{aligned} &\text{Balanced Equation: } 3\text{Fe}_3\text{O}_4 + 8\text{Al} ightarrow 4\text{Al}_2\text{O}_3 + 9\text{Fe}\ &\text{Coefficient of Fe} = 9 \end{aligned} $$

(A) 3

(B) 4

(C) 6

(D) 9

{ "subject": "Natural Science", "question_type": "Multiple Choice", "knowledge_point": [ "Natural Science", "Chemistry", "Balancing Chemical Equations" ] }

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Balance oxygen atoms

Balance aluminum and iron atoms

Identify the coefficient of Fe

Answer: