किसी पदार्थ के (1.6,g) को (200,g) जल में घोलने पर \(\Delta T_f=0.744,K\) मिला। यदि सामान्य मोलर द्रव्यमान \(80,g,mol^{-1}\) और \(K_f=1.86,K,kg,mol^{-1}\) है, तो (i) क्या होगा?
When (1.6,g) of a substance is dissolved in (200,g) water, \(\Delta T_f=0.744,K\) is obtained. If normal molar mass is \(80,g,mol^{-1}\) and \(K_f=1.86,K,kg,mol^{-1}\), what is (i)?
Explanation opens after your attempt
D. (4)
Concept
Normal moles \(=\frac{1.6}{80}=0.02,mol\), and solvent (=0.2,kg), so (m=0.1,m).
Why this answer is correct
Normal \(\Delta T_f=1.86\times0.1=0.186,K\).
Exam Tip
\(i=\frac{0.744}{0.186}=4\), meaning effective particles are four times. चरण 1: सामान्य मोल \(=\frac{1.6}{80}=0.02,mol\), और विलायक (0.2,kg), इसलिए (m=0.1,m)। चरण 2: सामान्य \(\Delta T_f=1.86\times0.1=0.186,K\)। चरण 3: \(i=\frac{0.744}{0.186}=4\), यानी प्रभावी कण चार गुना हैं।
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