The density of a solution is . The % by weight of is: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
The density of a $3M \text{ Na}_2S_2O_3$ solution is $1.25 \text{ g/mL}$. The % by weight of $Na_2S_2O_3$ is:
Answer: A
💡 Solution & Explanation
$\text{Mass of 1L solution} = 1250 \text{ g}$. $\text{Mass of solute} = 3 \times 158 = 474 \text{ g}$. $\% = (474/1250) \times 100 = 37.92\%$. [9]
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