When \(50 cm 3\) of a saturated solution of a sugar (molar mass \(342.0 g\) / at \(404 c\) was evaporated to dryness \(31.2 g\) of dry solid was obtained. The solubility of sugar at \(40^{\circ} C\) is _____________
A. \(10.0\) moles \(cm ^{3}\) B. \(7 .\) Omoles \(dm ^{-3}\) C. 3.5 moles dm \(dm ^{-3}\ D. 6 moles \(dm ^{-4}\)
Correct Answer: D
Explanation
Sugar \(+\) solution \(=\) sugar solution \(50 cm ^3\)t \(40^{\circ} C\) solubility \(=34.2 g\) in \(50 g\) water Solution contain \(34.2 g\) \(342 q\) No. of mole \(=34.2 g / mol\) \(=0.1\) mole Solubility in \(mol / dm =\underline{10.1}\) \(=0.1 \times 20\) \(=2 mol / dm ^3\)
