Please fill in the following chart based on the given data Note: The substance i

Question

Please fill in the following chart based on the given data

Note: The substance is actually KCl, the measured mass for H2O is: 10g and the measured mass for KCl is .780g(used the molar mass of KCl) to make a 1.00M soln of KCL soln. Graph shown.

1 Time Temperatu 23, -0.5 23 1.0 180 210 -10 15 270 330 2.0 E 3 390 420 450 480 510 -10.5 -13 570 21 Sheet1 Ready Time v Temperature Pure water (solvent) °C (from graph) NaCI solutions Mass H20, g Mass NaCI, g Molality NaCI TE C (from graph) AT C AT (m k) 1 m NaCl 2 mNaCI

Explanation / Answer

Depression in freezing point

mass of H2O = 10 g

mass KCl = 0.780 g

molality KCl = 0.780/74.55 x 0.01

                    = 1.05 m

TfoC (from graph) = -1 oC

dTf = 1 oC

i = 1/1.05 x 1.86

  = 0.51

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