Homework Help: chemistry

Posted by CC on Tuesday, February 9, 2010 at 11:41pm.

A 0.750 g sample of an unknown substance is dissolved in 20.0 g of benzene, C6H6. The freezing point of the solution is 4.53 oC. Calculate the molar mass of the substance. The normal freezing point for benzene is 5.53 oC and Kf is 5.12 oC/m.

chemistry - DrBob222, Tuesday, February 9, 2010 at 11:43pm
delta T = Kf*m
Calculate m
m = mols/kg solvent.
calculate moles.
moles = grams/molar mass
calculate molar mass.

Answer this Question

Related Questions

chemistry - A 0.750 g sample of an unknown substance is dissolved in 20.0 g of ...
chemistry - 10.0 g sample of p-dichlorobenzene, a component of mothballs, is ...
general chemisty - Calculate the freezing point of a solution of 20.0 g methyl ...
chemistry - A 0.0230 g sample of an unknown was dissolved in 2.260 g of benzene...
chem- molar weight - I worked this problem, I would like to know if I did it ...
Chemistry - What is the freezing point of a solution of 1.17g of 1-naphthol, ...
Chemistry - When 0.500 g of an unknown compound was dissolved in 15.0 g benzene...
chemistry - When 0.500 g of an unknown compound was dissolved in 15.0 g benzene...
Chemistry - Pure benzene has a normal freezing point of 5.50 degrees Celsius. A...
URGENT -- Chemistry - When 0.500 g of an unknown compound was dissolved in 15.0 ...

For Further Reading

First Name:
School Subject:
Answer: