Question

1) The vapor pressure of benzene, C6H6, is 100.0 torr at 26.1 ∘C. Assuming Raoult’s law is obeyed, how many moles of a nonvolatile solute must be added to 100.0 mL of benzene to decrease its vapor pressure by 10.0% at 26.1 ∘C? The density of benzene is 0.8765 g/cm3.

2) Which of the following actions will raise the osmotic pressure of a solution?

increasing the temperature
	adding more solvent
	decreasing the temperature
	decreasing the solute concentration
3) Which aqueous solution will have the lowest freezing point? 0.20 m C12H22O11 0.15 m NaCl 0.10 m HCl 0.050 m CaCl2 0.050 m CH3COOH	none of the above

Answer 1