18 g of glucose, C6H12O6, is dissolved in 1 kg of water in a saucepan. The temperature at which water boil at 1.013 bar is-
(Kb for water is 0.52 K kg mol-1)
1. 383.202 K
2. 373.202 K
3. 363.202 K
4. 393.202 K
The boiling point of benzene is 353.23 K. When 1.80 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. The molar mass of the solute is:
Kb for benzene is 2.53 K kg mol–1
1. 55 g mol–1
2. 64 g mol–1
3. 58 g mol–1
4. 68 g mol–1
1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol–1. The molar mass of the solute is:
1. | 245 g mol–1 |
2. | 256 g mol–1 |
3. | 264 g mol–1 |
4. | 274 g mol–1 |