Someone knowledgeable please help with the calculation part on my lab because im wasting questions without getting any help. This is a Colligative Property lab we did and below is the data along with the question.

The question is in the picture below but we basically have to determine the freezing point Tf of solution 1 by subtracting the Tf of solution 1 from the Tf of pure butanol.

Again I've already completed the experiment and the data is below for reference.

Data Handling, Calculations and Questions: Use graph paper and plot temperature vs. time for the pure t-butanol and for each solution analyzed; make 3 different graphs. Use the discussion in the background section above as a guide and determine the freezing point, Tf, of t-butanol and of each solution. Clearly mark on each graph all your data points and the best fit lines you used to determine freezing point. Determine the Tf of solution 1 by subtracting the Tf of solution 1 from the Tf of pure t-butanol. Tf of solution = Use the Tf for solution along with the mass of unknown in solution I, line 4 of the data table, the mass of solvent, t-butanol, line 3b of the data table, and the kf of t-butanol, 9.10Ckg solvent /mol solute, in Eq 6 to determine the molar mass, M, of your unknown compound. M, of your unknown compound = 1) Mass of test tube: 2) Mass of test tube and t-butanol: 3) a) Mass of t-butanol (line 2 - line 1 ): 9. 40000 b) Mass of t-butanol in kgs: .009ks 4) Mass of first sample of unknown: 0.64g * roarnid every 15 seconds Data Handling, Calculations and Questions: Use graph paper and plot temperature vs. time for the pure t-butanol and for each solution analyzed; make 3 different graphs. Use the discussion in the background section above as a guide and determine the freezing point, Tf, of t-butanol and of each solution. Clearly mark on each graph all your data points and the best fit lines you used to determine freezing point. Determine the Tf of solution 1 by subtracting the Tf of solution 1 from the Tf of pure t-butanol. Tf of solution = Use the Tf for solution along with the mass of unknown in solution I, line 4 of the data table, the mass of solvent, t-butanol, line 3b of the data table, and the kf of t-butanol, 9.10Ckg solvent /mol solute, in Eq 6 to determine the molar mass, M, of your unknown compound. M, of your unknown compound = 1) Mass of test tube: 2) Mass of test tube and t-butanol: 3) a) Mass of t-butanol (line 2 - line 1 ): 9. 40000 b) Mass of t-butanol in kgs: .009ks 4) Mass of first sample of unknown: 0.64g * roarnid every 15 seconds