0 points estimate the boiling point elevation of 1 51

1.0 points
Estimate the boiling point elevation of 1 . 51%
by mass CO(NH
2
)
2
(aq). The boiling point
constant of water is 0 . 51 K · kg / mol.
Correct answer: 0 . 13045
◦
C.

Version 094 – Homewrok 3 – Fakhreddine – (53605) 5
◦
C, should this solution freeze? Assume that
the solute is not volatile and does not ionize
and does not associate in the solution. HINT:
You can save a LOT of calculation if you think
carefully about the problem before you begin
calculations.
F. Suppose
you wanted to accomplish the same thing with
sugar (sucrose, C
12
H
22
O
11
) instead of ethy-
lene glycol. How many kilograms of sucrose
would you use? 1 gallon = 3.785 liters.
5. 4 . 68 × 10
− 3
kg
Explanation:
013 1.0 points
A solution of 0.90 g of an unknown non-
electrolyte in 300 mL of water at 27
◦
C has
an osmotic pressure of 38.4 torr. What is
the molecular weight of this compound? (Ne-
glect volume change due to solute, R = 0.0821
L · atm/mol · K)

Version 094 – Homewrok 3 – Fakhreddine – (53605) 6
side of the U-tube shown below. Pure water
is placed in the tube on the other side of the
semipermeable membrane. With the left side
open to barometric pressure of 1.0 atm and
1.5 atm applied to the right side, the two
liquids do not move.
1.00 atm
1.15 atm
B A
In which half of the U-tube is the pure water
located?