consider the reaction $2\text{cucl}_2 + 4\text{ki} \
ightarrow 2\text{cui} + 4\text{kcl} + \text{i}_2$. if 4 moles of $\text{cucl}_2$ react with 4 moles of $\text{ki}$, what is the limiting reactant?

- $\text{cucl}_2$
- $\text{ki}$
- $\text{cui}$
- $\text{i}_2$

Question

consider the reaction $2\text{cucl}_2 + 4\text{ki} \
ightarrow 2\text{cui} + 4\text{kcl} + \text{i}_2$. if 4 moles of $\text{cucl}_2$ react with 4 moles of $\text{ki}$, what is the limiting reactant?

- $\text{cucl}_2$
- $\text{ki}$
- $\text{cui}$
- $\text{i}_2$

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "multiple_choice_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "Limiting Reactant" ], "new_concepts": [], "current_concepts": [ "Limiting Reactant", "Stoichiometric Calculations" ] } ## Write the balanced chemical equation and given quantities $$ \begin{aligned} &2\text{CuCl}_2 + 4\text{KI} ightarrow 2\text{CuI} + 4\text{KCl} + \text{I}_2\ &n(\text{CuCl}_2)_{\text{initial}} = 4\text{ mol}\ &n(\text{KI})_{\text{initial}} = 4\text{ mol} \end{aligned} $$ ## Calculate the mole ratio of reactants to coefficients $$ \begin{aligned} &\text{Ratio for }\text{CuCl}_2 = \frac{4\text{ mol}}{2} = 2\ &\text{Ratio for }\text{KI} = \frac{4\text{ mol}}{4} = 1 \end{aligned} $$ ## Determine the limiting reactant by comparing ratios $$ \begin{aligned} &1 < 2 \implies \text{KI is the limiting reactant} \end{aligned} $$

$\text{CuCl}_2$

$\text{KI}$

$\text{CuI}$

$\text{I}_2$

{ "subject": "Natural Science", "question_type": "Multiple Choice", "knowledge_point": [ "Natural Science", "Chemistry", "Limiting Reactant" ] }

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QUESTION IMAGE

Question

Explanation:

Write the balanced chemical equation and given quantities

Calculate the mole ratio of reactants to coefficients

Determine the limiting reactant by comparing ratios

Answer: