**Passage 3:** What is the mole fraction of in this aqueous solution? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
**Passage 3:** What is the mole fraction of $NaOH$ in this $10\% \text{ (w/w)}$ aqueous solution?
Answer: A
💡 Solution & Explanation
$\text{moles solute} = 10/40 = 0.25$. <br>$\text{moles water} = 90/18 = 5$. <br>$\chi = 0.25 / (0.25 + 5) = 0.25 / 5.25 \approx 0.047$.
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