Homework Help: chemistry

Posted by blah..unsure..plz help!! on Friday, March 6, 2009 at 10:49pm.

1.)What is the boiling point of the water in your radiator if 2.00kg of antifreeze is added to 9.00 * 10^3 grams of water?

2.)Assuming that each system behaves ideally, which solution (0.25 m KCl or 0.25 m C3H8O3)would have the lower freezing point? Explain.

My answer: I say that C3H8O3 would have the lower point because of hydrogen??? right or wrong

3.)Is the following statement true or false: "Dissolving a nonvolatile solute in a solvent has the effect of extending the temperature range over which the solvent remains in the liquid phase." Explain.

My answer: I say this statement is true.????

chemistry - DrBob222, Friday, March 6, 2009 at 11:15pm
1. You don't have enough information to work the problem.
2,000 g/molar mass of the antifreeze (whatever that happens to be) = moles antifreeze.
molality = moles/kg = moles/9 kg solvnt.
Then delta T = Kb*molality
Then added delta T to 100 C to find boiling point. (Note; this is not an accurate process to determine the boiling point of radiator water BECAUSE the system is under more than 1 atm pressure when the engine is running and that increases the boiling point, also.)

2. What in the world is C3H8O3? My guess however is that the answer is C3H8O3 but not for the reason you cite. I think it's lower because KCl breaks into two particles and the C3H8O3 PROBABLY is a covalent compound (not ionic as is KCl).
3. I think #3 is true.
chemistry - jim, Friday, March 6, 2009 at 11:31pm
its c3ho5
chemistry - dria B., Tuesday, March 16, 2010 at 7:54pm
#3- When a non-volatile solute is added to a solvent, the resulting solution has different physical properties than the pure solvent.

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