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Topic: Molar mass....Please HElp  (Read 4483 times)

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Offline vnveteran

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Molar mass....Please HElp
« on: January 23, 2010, 03:50:06 PM »
A 1.178 sample of an unknown substance was dissolved in 200.0 mL of cyclohexane.  The density of cyclohexane is 0.779g/mL.  The freezing point depression is 3.6oC. Calculate the molar mass of the unknown substance.
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Offline vnveteran

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Re: Molar mass....Please HElp
« Reply #1 on: January 23, 2010, 07:34:45 PM »
i have no idea where to start....i honestly really need help with this problem.....i  just don't understand how i am suppose to find the molar mass it if i don't know what it is???like i feel they don't give me enough information.
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Offline Xuanny

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Re: Molar mass....Please HElp
« Reply #2 on: January 23, 2010, 08:03:31 PM »
"i  just don't understand how i am suppose to find the molar mass it if i don't know what it is???"
If you were given the molar mass, there would be no problem. Do you know anything about freezing point depression? (Was this in class or some random problem you found?)
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Offline cliverlong

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Re: Molar mass....Please HElp
« Reply #3 on: January 24, 2010, 03:41:56 AM »
Quote from: vnveteran on January 23, 2010, 07:34:45 PM
i have no idea where to start....i honestly really need help with this problem.....i  just don't understand how i am suppose to find the molar mass it if i don't know what it is???like i feel they don't give me enough information.
http://lmgtfy.com/?q=freezing+point+depression+molar+mass
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