1. Do you know this was a non-ionic compound?
2. -0.58-(-0.93) = 0.35
3. Using the 0.35 for the depression, I would not round to 0.0035 since the use of significant figures is not consistent.
4. What are the options for the molar mass?
5. What are the options for the compounds?
I need help on my lab. I think I have all the data and steps right, but my results aren't making sense:
Feezing point of water: -0.58 C
Freezing point of Unknown: -0.93 C
Freezing point depressions: 0.34 C
Mass of unknown: 1.045 g, mass of solvent (water): 19 ml, Water=1.86 C/m, Tf=Kfm
0.34 = 1.86*m
m=0.183
0.183=moles of solute/.019 kg
moles of solute = .0035
molar mass = 1.045g/.0035
= 298.57 g/mol
However this molar mass doesn't match any of the options I have for what the unknown compounds might be. Can you see anything I might have made a mistake on?
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