(Passage 5) of a mixture of and was dissolved in water. Excess gave 21.5 g of . The percentage of in — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
(Passage 5) $10 \text{ g}$ of a mixture of $NaCl$ and $KCl$ was dissolved in water. Excess $AgNO_3$ gave 21.5 g of $AgCl$. The percentage of $NaCl$ in the mixture is:
Answer: A
💡 Solution & Explanation
Let $x$ be mass of $NaCl$. $x/58.5 + (10-x)/74.5 = 21.5/143.5 \approx 0.15$. Solving gives $x \approx 4.3 \text{ g} \Rightarrow 43\%$.
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