Use Excel to create three separate graphs of Temperature versus Time \" for the

Question

Use Excel to create three separate graphs of Temperature versus Time " for the pure solvent and the two solutions studied Each graph should have an appropriate title and labeled axes with an appropriate scale. Add two trend lines to the data points of each graph. You can do this by hand with a ruler or by using Excel. The first line is applied to data part that correspond to line is applied o data points that correspond to the co-existence of both the solid and liquid (freezing) - these are the points on the part of the graph where the temperature levels out Extrapolate the two trendlines towards each other until they intersect The temperature at the point of intersection is the solvent freezing point and should be dearly shown on each graph Attach your three graphs to this report. Record the freezing point temperatures obtained from the graphs below: Pure PDB Solution Solution Calculation of Molar Mass Complete the table below with the results of your calculations. Be sure to include ad units Note that K, PDB = 7.10 degree C kg mol^-1 Unknown number has an average molar mass of g/mol On a separate sheet of paper, show the equations used and calculations performed for Attach your sheet to this report.

Explanation / Answer

Q7:

moles of unkown in solution:

dTF = K*m

m = dTF / K

where --> dTf temperature of dpression point, in this case = 4°C dpression

K = 7.10 for specie

then

m = 4/7.1 = 0.563 molal

for solution 2

m = 7/7.1 = 0.985 molal

so...

for solvent mass in kjg = 0.026574 kg

molal = mol of solute / Kg solvent

so

mol of solute = molal*kg solvent

solution 1 = 0.563 *0.026574 = 0.01496 moles, or 0.015

solution 2 = 0.985 *0.026574 = 0.026175 moles, or 0.2026

Q8

for Molar MAss

solution 1

MM = mass / mol = 1.99 / 0.015 = 132.666 g/mol

solution 2

MM = mass / mol = 2.07/0.026175 = 79.083 g/mol

Related Questions

Navigate

• Browse (All)
• Browse U
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.