Chemistry
posted by Colin .
assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at 14.5 C? The freezing point for pure water is 0.0 C and is equal to 1.86 C/m .

Chemistry 
DrBob222
delta T = i*Kf*m
where i = 2, solve for m.
m = moles/kg solvent
Solve for moles.
moles = g/molar mass
solve for grams.
Respond to this Question
Similar Questions

CHemistry....Please help
What mass of ethylene glycol C2H6O2, the main component of antifreeze, must be added to 10.0 L water to produce a solution for use in a car's radiator that freezes at 23C? 
Chemistry: molality and freezing point?
What mass of ethylene glycol C2H6O2, the main component of antifreeze, must be added to 10.0 L water to produce a solution for use in a car's radiator that freezes at 23.3C? 
Chemistry
Assuming complete dissociation of the solute, how many grams of KNO_3 must be added to 275mL of water to produce a solution that freezes at 14.5C? 
Chemistry
Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at 14.5 C? 
Chemistry
Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at 14.5 degrees celcius ? 
Chemistry
The vapor pressure of pure water at 90celsius is normally 525.8 but decreased 483mmHg upon addition of an unknown amount of KNO3 to 286.9g H2O at this temperature. how many grams KNO3 were added. ASSUME COMPLETE DISSOCIATION OF SOLUTE. … 
chemistry
1. Would it be advisable to determine the freezing point of pure pdichlorobenzene with one thermometer and the freezing point of the solution with a different one? 
chemistry
assuming complete dissociation of the solute, how many grams of \rm KNO_3 must be added to 275 \rm mL of water to produce a solution that freezes at 14.5 ^\circ {\rm C}? 
Chemistry
1. Would it be advisable to determine the freezing point of pure pdichlorobenzene with one thermometer and the freezing point of the solution with a different one? 
Chemistry
Confused on these, please explain or show work for the answer if you can. :) 1. What is the morality of a water solution that freezes at 0.633°C?