please answer all the questions

1. A student beginning this experiment accidentally spilled some t-butyl alcohol on his hands and on the laboratory bench. Describe any potential danger this situation might cause and state the proper method of cleaning up from the accident. 2. The freezing point depression of a solution of nitrobenzene and a nonionic unknown was used to determine the molar mass of the unknown. Timetemperature data for the cooling of nitrobenzene and for the cooling of a solution containing 50.0g of nitrobenzene and 5.00mL of a nonionic liquid unknown, are given below. The density of the unknown was 0.714g/mL. The K, of nitrobenzene is 6.87CKg/mol. a) Using Excel, plot the cooling curve of nitrobenzene and nitrobenzene + unknown on the same graph. b) Determine the freezing point of nitrobenzene from the curve. c) Determine the freezing point of the nitrobenzene + unknown solution. d) Determine the freezing point depression, Tr e) Calculate the molality of the solution, mc. f) Calculate the gram molar mass of the unknown. 3. Briefly explain why it is absolutely critical that the test tube containing the sample of nitrobenzene be absolutely dry when determining the freezing temperature of nitrobenzene