यदि \(K_f=1.86,K,kg,mol^{-1}\), विलेय (2.5,g), विलायक (250,g), और मोलर द्रव्यमान \(100,g,mol^{-1}\) है, तो अवियोजित विलेय के लिए \(\Delta T_f\) कितना होगा?
If \(K_f=1.86,K,kg,mol^{-1}\), solute mass is (2.5,g), solvent mass is (250,g), and molar mass is \(100,g,mol^{-1}\), what will be \(\Delta T_f\) for a non-dissociated solute?
Explanation opens after your attempt
B. (0.186,K)
Concept
विलेय के मोल \(\frac{2.5}{100}=0.025\) हैं। / Moles of solute \(=\frac{2.5}{100}=0.025\).
Why this answer is correct
(250,g=0.25,kg), इसलिए मोललता \(m=\frac{0.025}{0.25}=0.1\)। / (250,g=0.25,kg), so molality \(m=\frac{0.025}{0.25}=0.1\).
Exam Tip
\(\Delta T_f=K_fm=1.86\times0.1=0.186,K\)। / \(\Delta T_f=K_fm=1.86\times0.1=0.186,K\).
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