किसी विलेय के (2.5,g) को (500,g) जल में घोलने पर \(\Delta T_f=0.2325,K\) है। यदि (i=1.25), तो वास्तविक मोलर द्रव्यमान क्या होगा?
When (2.5,g) solute is dissolved in (500,g) water, \(\Delta T_f=0.2325,K\). If (i=1.25), what is the true molar mass?
Explanation opens after your attempt
B. \(50,g,mol^{-1}\)
Concept
प्रभावी मोललता \(\frac{0.2325}{1.86}=0.125\) है। / Effective molality \(=\frac{0.2325}{1.86}=0.125\).
Why this answer is correct
वास्तविक मोललता \(\frac{0.125}{1.25}=0.1\) होगी। / True molality \(=\frac{0.125}{1.25}=0.1\).
Exam Tip
(500,g=0.5,kg), मोल \(0.1\times0.5=0.05\), अतः मोलर द्रव्यमान \(=\frac{2.5}{0.05}=50,g,mol^{-1}\)। / (500,g=0.5,kg), moles \(=0.1\times0.5=0.05\), so molar mass \(=\frac{2.5}{0.05}=50,g,mol^{-1}\).
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