Find the value of in the formula if of the salt yields of anhydrous salt on heating. — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
Find the value of $n$ in the formula $Na_2S_2O_3 \cdot nH_2O$ if $2.48\text{ g}$ of the salt yields $1.58\text{ g}$ of anhydrous salt on heating.
Answer: 5
💡 Solution & Explanation
$\text{Mass } H_2O = 2.48 - 1.58 = 0.90\text{ g}$. <br>$\text{moles } H_2O = 0.90 / 18 = 0.05\text{ mol}$. <br>$\text{moles anhydrous } Na_2S_2O_3 = 1.58 / 158 = 0.01\text{ mol}$. <br>$n = 0.05 / 0.01 = 5$.
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