किसी विलेय के (1.2,g) को (150,g) विलायक में घोलने पर \(\Delta T_b=0.104,K\) है। यदि \(K_b=0.52,K,kg,mol^{-1}\) और विलेय (i=2) दिखाता है, तो वास्तविक मोलर द्रव्यमान क्या होगा?
When (1.2,g) solute is dissolved in (150,g) solvent, \(\Delta T_b=0.104,K\). If \(K_b=0.52,K,kg,mol^{-1}\) and the solute shows (i=2), what is the true molar mass?
Explanation opens after your attempt
B. \(80,g,mol^{-1}\)
Concept
प्रभावी मोललता \(\frac{0.104}{0.52}=0.2\) है। / Effective molality \(=\frac{0.104}{0.52}=0.2\).
Why this answer is correct
वास्तविक मोललता \(\frac{0.2}{2}=0.1\) होगी। / True molality \(=\frac{0.2}{2}=0.1\).
Exam Tip
(150,g=0.15,kg), मोल \(0.1\times0.15=0.015\), अतः मोलर द्रव्यमान \(\frac{1.2}{0.015}=80,g,mol^{-1}\)। / (150,g=0.15,kg), moles \(=0.1\times0.15=0.015\), so molar mass \(=\frac{1.2}{0.015}=80,g,mol^{-1}\).
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