Question

The freezing point of water H₂O is 0.00°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in water is urea .  

If 11.34 grams of urea, CH₄N₂O (60.10 g/mol), are dissolved in 259.5 grams of water ...

The molality of the solution is _____ m.

The freezing point of the solution is _____°C.

__________

The boiling point of chloroform CHCl₃ is 61.70°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in chloroform is aspirin .  

How many grams of aspirin, C₉H₈O₄ (180.1 g/mol), must be dissolved in 206.0 grams of chloroform to raise the boiling point by 0.350 °C ? Refer to the table for the necessary boiling or freezing point constant.

Solvent	Formula	Kb (°C/m)	Kf (°C/m)
Water	H2O	0.512	1.86
Ethanol	CH3CH2OH	1.22	1.99
Chloroform	CHCl3	3.67
Benzene	C6H6	2.53	5.12
Diethyl ether	CH3CH2OCH2CH3	2.02

Answer: _____ g aspirin.

Answer 1