Raising temp makes liquid molecules move faster surface tension and viscosity are reduced, but molecules at surface escape to gas phase more easily so vapor pressure in increased.

.11 g

a 95.3 degrees C

b 611 mmHG

Use C-C twice. In step 1 find delta H = 39 kJ.

Remember that the vapor pressure at the normal boiling point if 1 atm= 760 mm Hg. In step 2 use either the normal bp or the critical point and delta H to find the vapor pressure at 100 °C. Remember that all temps are in Kelvin.

P = 489 mm Hg

P crit 77.7 atm and T crit 431.0 K. SO2 is liq at O degrees C and 1 atm.

Methane cannot be liq at O degrees C.

a lower right gas and upper right liquid

b lowest P for liquid at triple point 43 atm. At 1 atm liquid does not exist

c going from A to B. First nothing; solid liquefies; nothing; sample vaporizes; gas gets less dense; B.

Cl for H increases London and dipolar forces so bp is increased.

Br for Cl increases London but decreases the less important dipole interactions so the bp increases. (this is a tough call on the London vs. dipole and I wouldn't necessarily expect you to predict this--although if you are given the data you should be able to explain which forces predominate).

OH for Br decrease London but increases H bonding and dipole so bp increases.

a No H bonding in C2H6

b Intramolecular H bonding cannot occur in H3CCH2OH because the OH has nothing to H bond to

c Intramolecular H bonding could occur only if a strained 4 membered ring were formed. This is not likely because some 90 degree bond angles are necessary.

d Yes--making a larger ring will not cause bond angle strain.

C60 spheres are nonpolar molecular solid like P4 and S8. The carbon chain with alternating single and triple bonds could be a network solid like graphite. These would be linear molecules like sphaghetti and would pack together like spaghetti in a box with pi electrons on neighboring rods attracting each other.

Use Colomb's Law from appendix

Find MgO interionic forces are 7 times stronger than in NaCl

6.0214 x 10^23 formula units /mole

Use Hess's Law

Lattice Energy -827 kJ/mol

Use C-C equation

P= 43.1 mm Hg which is greater than water's vapor pressure

.648 mole vapor

54.3% dimer