**Passage 1:** For the same reaction with and , how many moles of the excess reagent remain? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
**Passage 1:** For the same reaction $2A + 3B \rightarrow 4C + 5D$ with $5 \text{ moles of A}$ and $9 \text{ moles of B}$, how many moles of the excess reagent remain?
Answer: A
💡 Solution & Explanation
$A$ is limiting. Moles of $B$ reacted $= (3/2) \times 5 = 7.5 \text{ moles}$. <br>$\text{Excess B} = \text{Initial} - \text{Reacted} = 9 - 7.5 = 1.5 \text{ moles}$.
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