COMEDK · Chemistry · 17. Solutions
The mass of a non-volatile solute of molar mass \(60 \mathrm{~g} \mathrm{~mol}^{-1}\) that should be dissolved in \(126 \mathrm{~g}\) of water to reduce its vapour pressure to \(99 \%\) will be
- A \(2.8 \mathrm{~g}\)
- B \(5.6 \mathrm{~g}\)
- C \(8.4 \mathrm{~g}\)
- D \(4.2 \mathrm{~g}\)
Answer & Solution
Correct Answer
(D) \(4.2 \mathrm{~g}\)
Step-by-step Solution
Detailed explanation
Given, molar mass of solute, \(\mu_{2}=60 \mathrm{~g} / \mathrm{mol}\) Mass of water \(\left(W_{1}\right)=126 \mathrm{~g}^{\circ}\) Molar mass of water \(\left(M_{1}\right)=18 \mathrm{~g} / \mathrm{mol}\) \(p_{\text {Solution }}\left(p_{s}\right)=0.99 p^{\circ}\) Relative…
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