किसी विलेय के (1.8,g) को (150,g) जल में घोलने पर \(\Delta T_f=0.279,K\) है। यदि (i=0.75), तो वास्तविक मोलर द्रव्यमान कितना होगा?
When (1.8,g) solute is dissolved in (150,g) water, \(\Delta T_f=0.279,K\). If (i=0.75), what is the true molar mass?
Explanation opens after your attempt
B. \(60,g,mol^{-1}\)
Concept
प्रभावी मोललता \(\frac{0.279}{1.86}=0.15\) है। / Effective molality \(=\frac{0.279}{1.86}=0.15\).
Why this answer is correct
वास्तविक मोललता \(\frac{0.15}{0.75}=0.2\) होगी। / True molality \(=\frac{0.15}{0.75}=0.2\).
Exam Tip
(150,g=0.15,kg), मोल \(0.2\times0.15=0.03\), इसलिए मोलर द्रव्यमान \(=\frac{1.8}{0.03}=60,g,mol^{-1}\)। / (150,g=0.15,kg), moles \(=0.2\times0.15=0.03\), so molar mass \(=\frac{1.8}{0.03}=60,g,mol^{-1}\).
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