My Chemistry Tutor
March 14, 2010, 12:03:30 PM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
Unlimited Game Rentals Delivered - Free Trial
News:
 
   Home   Help Search GoogleTagged Login Register  


Pages: [1]
« previous next »
  Print  
Author Topic: Molality  (Read 227 times)
sswa0322
Labrat
*
Posts: 8


View Profile
« on: December 12, 2009, 02:29:46 PM »
In this experiment, suppose that 1.10 grams of an unknown solid is added to 14.65 grams of naphthalene. The change in temperature of the freezing point for the experiment is determined to be 5.87 degrees Celsius. Calculate the molality of the solution. ( Kf for Napthalene = 6.80 c/m)
Logged
kingchemist
Global Moderator
Hero Member
*****
Posts: 2584

A Liverpool FC fan


View Profile
« Reply #1 on: December 13, 2009, 05:48:00 AM »
[delta]T = Kf * m where m = molality, Kf is the cryoscopic constant and [delta]T is the temperature change

So find molality (=moles/kg solvent)

You could go on to find the molar mass of the unknown though question does not ask for this
« Last Edit: December 13, 2009, 05:50:57 AM by kingchemist » Logged
'Chemistry is not just the study of matter; Chemistry is the study which matters!' - Kingchemist
Pages: [1]
  Print  
« previous next »
 
Jump to:  

* Share this topic...
In a forum
(BBCode)
In a site/blog
(HTML)

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!