एक विलेय के (1.5,g) से (500,mL) विलयन बनाया गया। (300,K) पर परासरण दाब (0.615,atm) है। \(R=0.082,L,atm,mol^{-1},K^{-1}\) हो तो मोलर द्रव्यमान क्या होगा?
A solution of volume (500,mL) is prepared using (1.5,g) solute. Its osmotic pressure at (300,K) is (0.615,atm). If \(R=0.082,L,atm,mol^{-1},K^{-1}\), what is the molar mass?
Explanation opens after your attempt
C. \(120,g,mol^{-1}\)
Concept
\(C=\frac{\pi}{RT}=\frac{0.615}{0.082\times300}=0.025,M\).
Why this answer is correct
(500,mL=0.5,L), so moles \(=0.025\times0.5=0.0125\).
Exam Tip
Molar mass \(=\frac{1.5}{0.0125}=120,g,mol^{-1}\). चरण 1: \(C=\frac{\pi}{RT}=\frac{0.615}{0.082\times300}=0.025,M\)। चरण 2: (500,mL=0.5,L), इसलिए मोल \(0.025\times0.5=0.0125\) हैं। चरण 3: मोलर द्रव्यमान \(=\frac{1.5}{0.0125}=120,g,mol^{-1}\)।
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