The density of is . Calculate the mole fraction of . — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
The density of $3 \text{ M } Na_2S_2O_3$ is $1.25 \text{ g/mL}$. Calculate the mole fraction of $Na_2S_2O_3$.
Answer: 0.065
💡 Solution & Explanation
$\text{Mass of 1 L} = 1250 \text{ g}$. $\text{Solute} = 3 \times 158 = 474 \text{ g}$. <br>$\text{Solvent} = 1250 - 474 = 776 \text{ g}$. <br>$\text{moles water} = 776 / 18 = 43.11 \text{ mol}$. <br>$\chi = \frac{3}{3 + 43.11} \approx 0.065$.
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