What is "other than 7g benzophenone" mean?
1. Compare the freezing point constants, Kf, for the solvents.
2. How accurately can you read the thermometer.
I would use those two things and calculate about how much of the solvent and how much of the unknown would be needed to read the temperature with reasonable accuracy using about 175 for the molar mass.
if calculating molecular weight of unknown by freezing point depression...All of the unknowns in the activity were nonpolar organic molecules with molecular weight= 100-250 g/mol and using around 1g of the unknown. Provide an example of a solvent that could possibly be used for this experiment and provide reasons why it would be a good choice. Provide a solvent that should not be used for this experiment and provide reasons why it would not be a great choice. Other than using around 7g of benzophenone.
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