किसी अवियोजित विलेय के (5,g) को (250,g) विलायक में घोलने पर क्वथनांक (0.104,K) बढ़ता है। \(K_b=0.52,K,kg,mol^{-1}\) होने पर मोलर द्रव्यमान कितना होगा?
When (5,g) of a non-dissociated solute is dissolved in (250,g) solvent, the boiling point increases by (0.104,K). If \(K_b=0.52,K,kg,mol^{-1}\), what is the molar mass?
Explanation opens after your attempt
C. \(100,g,mol^{-1}\)
Concept
\(\Delta T_b=K_bm\), so \(m=\frac{0.104}{0.52}=0.2\).
Why this answer is correct
(250,g=0.25,kg), so moles \(=0.2\times0.25=0.05\).
Exam Tip
Molar mass \(=\frac{5}{0.05}=100,g,mol^{-1}\). चरण 1: \(\Delta T_b=K_bm\), इसलिए \(m=\frac{0.104}{0.52}=0.2\)। चरण 2: (250,g=0.25,kg), इसलिए मोल \(0.2\times0.25=0.05\) होंगे। चरण 3: मोलर द्रव्यमान \(=\frac{5}{0.05}=100,g,mol^{-1}\)।
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