Homework Help: chemistry

Posted by jim on Monday, December 13, 2010 at 5:13pm.

What is the boiling point of the solution in which you are going to cook spaghetti if it contains 51.0 g of NaCl dissolved in 1.30 L of water? Assume the density of water is 1.00 g/mL. Use molar masses with at least as many significant figures as the data given. Enter your answer with two decimal places.

chemistry - DrBob222, Monday, December 13, 2010 at 5:40pm
moles NaCl = grams/molar mass
Solve for moles NaCl.

molality = moles NaCl/kg solvent
Solve for molality (kg solvent = 1.30).

delta T = i*Kb*molality
You have i = 2, Kb, and molality. Solve for delta T, then add that to 100 C to find the boiling point.
chemistry - jim, Monday, December 13, 2010 at 5:47pm
what's Kb?
chemistry - DrBob222, Monday, December 13, 2010 at 6:01pm
Isn't that 0.512 degrees C/m? I think so.

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