किसी विलेय के (1.5,g) को (100,g) जल में घोलने पर \(\Delta T_f=0.186,K\) है। यदि (i=0.75), तो वास्तविक मोलर द्रव्यमान क्या होगा?
When (1.5,g) solute is dissolved in (100,g) water, \(\Delta T_f=0.186,K\). If (i=0.75), what is the true molar mass?
Explanation opens after your attempt
A. \(50,g,mol^{-1}\)
Concept
प्रभावी मोललता \(\frac{0.186}{1.86}=0.1\) है। / Effective molality \(=\frac{0.186}{1.86}=0.1\).
Why this answer is correct
वास्तविक मोललता \(\frac{0.1}{0.75}=0.1333\) होगी। / True molality \(=\frac{0.1}{0.75}=0.1333\).
Exam Tip
(100,g=0.1,kg), मोल (0.01333), इसलिए मोलर द्रव्यमान \(\frac{1.5}{0.01333}\approx112.5,g,mol^{-1}\)। / (100,g=0.1,kg), moles (=0.01333), so molar mass \(=\frac{1.5}{0.01333}\approx112.5,g,mol^{-1}\).
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