[Unknown008]

so would the partial pressure of carbon dioxide be 0.661 atm?

Correct.

- log 2.40 x 10^-4 =3.62

would this be correct?

Correct also.

and also... some of this questions i posted i had already answered and turned in i just didn't feel good about them and wanted to know if i was correct and how to do it the correct way.

It's okay. :)

Hydrogen bonding in water contributes to

a. a decreased boiling point b. an increased vapor pressure
c. a decreased melting point d. an increase in volume on freezing
e. none of the above.

this was on a homework assignment and i put "e" because i wasn't sure. Probably wrong huh?

b. is true, the hydrogen bond will tend to raise the vapor pressure, thereby raising the melting and boiling points.

d. Here, water expands on cooling because the hydrogen bond has a specific length. In the liquid state, hydrogen bonds are constantly being formed and broken by other water molecules passing 'across' the bond. On cooling, since the molecules go slower, there is a lower probability that they will break the hydrogen bond.

So, I think that both b and d are correct.