Homework Help: Chemistry

Posted by Stephen on Wednesday, March 20, 2013 at 8:47pm.

If you add 100 g of salt to 5 Kg of cooking water, how will it effect the boiling point? (molar mass of NaCl 58.5 g, Kbwater=0.51 degrees/m)

Chemistry - DrBob222, Wednesday, March 20, 2013 at 10:29pm
mols NaCl = 5000 g/molar mass NaCl.
Solve for mols.

molality = moles solute/kilograms solvent
solve for molality

Delta T = Kb*m
solve for Delta T. The boiling point will be raised by the amount of Delta T.
delta T = Kb*m

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