chemistry help [SOLVED]

[thubby]

so im trying to calculate the DHvap of water.

P=9.369 KPa
t=322.15 kelvin
r=8.314

now, since that's all the data i have to work with, it means i have to use:
ln(p)=-(dHvap/r)(1/T)+c

but how do i know what C is?

EDIT: got it.

[Mando Knight]

What is C in the equation, and can you find it on a properties table?

[thubby]

What is C in the equation, and can you find it on a properties table?

C is a constant that's different for every compound. as i dont know what it actually represents, I can't google it like i could Dhvap.
(its a lab experiment, so i cant just use what i google, sadly)

[Mando Knight]

If I'm not mistaken, vaporization is something that occurs over time, and DHvap appears to be a constant. Do you have beginning and ending values for your experiment?

[thubby]

If I'm not mistaken, vaporization is something that occurs over time, and DHvap appears to be a constant. Do you have beginning and ending values for your experiment?

DHvap isn't a constant, but its reasonably stable in certain ranges.

according to the text, the first reading is designed to negate the impact of the water (so you can find the values related to the water later when air becomes a significant factor), and 0p kinda borks the entire equation.

edit: just thought of something, let me see if i get a reasonable answer.

[Rawhide]

I was going to make a chemistry joke, but unfortunately all the good ones argon.