Homework Help: chemistry

Posted by david on Monday, April 7, 2008 at 12:24pm.

When 18 g of ethylene glycol C2H6O2 is dissolved in 150 g of pure water, the freezing point of the solution is

_C . (The freezing point depression constant for water is 1.86C kg)

what i tried was 18/62 to find the moles. then i got .29/.150 to solve for the molality. then i got (.9350)(1.86) to solve for the temperature which is 3.6. i keep getting it wrong im i doing it right? please help. thanks

chemistry - DrBob222, Monday, April 7, 2008 at 1:33pm
delta T = Kb*m
m = 18/62 = 0.29 mols
molality = 0.29/0.15 = 1.93 m
delta T = 1.86 x 1.93 = 3.6 degrees.
The normal freezing point is zero, so the new freezing point must be 0.0 - 3.6 = -3.6. I suspect that's your problem. You are stopping at delta T which IS 3.6 but the freezing point is -3.6 C.
chemistry - david, Monday, April 7, 2008 at 1:55pm
thanks sooo much

Answer this Question

Related Questions

chem - freezing point - When 18 g of ethylene glycol C2H6O2 is dissolved in 150 ...
chemistry - When 18 g of ethylene glycol C2H6O2 is dissolved in 150 g of pure ...
Chemistry - What is the freezing point of a solution made by dissolving 450 g of...
chemistry - A 13.03 g sample contains only ethylene glycol (C2H6O2) and ...
chemistry - Calculate the vapor pressure of water over each of the following ...
Chem - An ethylene glycol solution contains 20.9 g of ethylene glycol (C2H6O2) ...
chemistry - What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be ...
chem - An ethylene glycol solution contains 23.9 g of ethylene glycol (C2H6O2) ...
chemistry - Automotive antifreeze consists of ethylene glycol, C2H6O2, a ...
Chemistry. - What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be ...

For Further Reading

First Name:
School Subject:
Answer: