One mole of sugar is dissolved in three moles of water at 298 K. The relative lowering of vapour pressure is:
1. | 0.25 | 2. | 0.15 |
3. | 0.50 | 4. | 0.33 |
If 8 g of a non-electrolyte solute is dissolved in 114 g of n-octane to reduce its vapor pressure to 80 %, the molar mass (in g mol–1) of the solute is:
[Molar mass of n-octane is 114 g mol–1]
1. | 40 | 2. | 60 |
3. | 80 | 4. | 20 |