1. Cotton is a polymer of glucose molecules. The linear chains of glucose are held together by H- bonds. Ironing uses heat and pressure to realign the polymer chains. Explain how adding water changes and improves the ironing process.
2. Fill in the missing values in the table below. Note for NA the values were not available. No need to try to calculate and cells that have an NA.
|
Substance
|
vapH(kcal/
|
Tb(K)
|
fusS(cal/Kmol
|
fusH(kcal/mol
|
Tm(K
|
fusS(cal/Kmol
|
| |
mole)
|
|
e)
|
e)
|
)
|
e)
|
|
Ethanol
|
9.2
|
351.5
|
|
102
|
185.
|
|
| |
|
|
|
|
5
|
|
|
Hexane
|
7.6
|
342
|
|
3.12
|
178
|
|
|
urea
|
NA
|
NA
|
NA
|
3.32
|
|
8.19
|
|
Laureic
|
NA
|
571
|
NA
|
8.8
|
317
|
|
|
acid
|
|
|
|
|
|
|
|
Oleic Acid
|
NA
|
NA
|
NA
|
|
286.
|
33
|
| |
|
|
|
|
5
|
|
|
Ammonia
|
23.35
|
239.7
|
|
5.65
|
195.
|
|
| |
|
|
|
|
4
|
|
|
Carbondioxide
|
6.06
|
194.6
(sublimation)
|
|
|
217
|
9.19
|
|
|
|
|
|
|
|
|
3. Below is a phase diagram for CO2. Using the upper portion (between T= -20°C to T=100°C) of the P/T line between the solid and liquid phases estimate the slope. Using the thermodynamic data for CO2 given in the table for #2 to calculate the change in volume that occurs upon melting. Note the Tm given here is the triple point T since there is no T at which the liquid exists at 1atm. Comment on the sign of the answer and what that means ( i.e. is does the volume increase on melting or decrease on melting).
4. Solve for the change in the volume using density for CO2.