gypsum
Probably not a bot. Junior Member.
Joined: 23 Nov 2006
Posts: 3
|
 Posted: Fri Jan 26, 2007 3:36 pm Post subject: hey |
 |
|
actually, this is a colligative properties...boiling point elevation and freezing point depression....you just calculate first the number of moles of ethylene glycol(62.01 g/mole) in a given amount of water, then calculate the number of moles of ethylene glycol in a 1 L of water or the molality, m...
#mole EG = (1000 g * 1mole/62.01 g) = 16.126 moles
m = 16.126 mole EG/4.45 Kg water = 3.624 m
delta Tf = (1.86 C/m)(3.624 m) = 6.740 degrees celcius
however, the water freezes at 0 degrees celcius, therefore, the freezing point of EG is - 6.74 degress celcius
delta Tb = (0.512)(3.624) = 1.856 C
but, water will boil at 100 c, then Tb for EG is 101.856 degress celcius.
just check it out...
|
|
