COMEDK · Chemistry · 17. Solutions
\(5 \mathrm{~g}\) of non-volatile water soluble compound \(X\) is dissolved in \(100 \mathrm{~g}\) of water. The elevation in boiling point is found to be 0.25 . The molecular mass of compound \(X\) is
- A 35 g
- B 40 g
- C 20 g
- D 60 g
Answer & Solution
Correct Answer
(C) 20 g
Step-by-step Solution
Detailed explanation
The elevation in boiling point is, \(\begin{aligned} \Delta T_b & =\frac{1000 k_b \times w_2}{M_2 \times w_1(\text { in }(\mathrm{g}))} \Rightarrow M_2=\frac{1000 \times k_b \times 5}{0.25 \times 100} \\ \Rightarrow M_2 & =20 \mathrm{~g} \end{aligned}\)
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