Question 1
Calculate the mass of maltose, C
12H
22O
11, contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C. The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.
◦ 94.1 g
◦ 265 g
◦ 482 g
◦ 163 g
◦ 329 g
Question 2
An unknown nonelectrolyte and nonvolatile compound is dissolved in enough pure water to make 348 mL of solution. The vapour pressure above the solution drops from 198.7 mbar to 196.7 mbar when 100.0 g of the compound is dissolved at constant temperature. Determine the molar mass of the unknown compound. Assume no change in volume occurs upon dissolution.
◦ 180 g mol
-1◦ 509 g mol
-1◦ 689 g mol
-1◦ 342 g mol
-1◦ 243 g mol
-1
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