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Pre-Lab Questions • Note - This pre-lab must be completed before you come to lab. 1. Write the ideal gas law. Give the units for each variable. 2. A laboratory group measures an excess of an unknown liquid. They add this to an empty flask for which they calculate the volume. They heat the sample n a water bath until all liquid has been vaporized for several minutes. The sample is cooled and measured. Use their laboratory data (listed below) to answer the following questions: Flask Volume Mass of flask Mass of Flask + volatile liquid Mass of volatile liquid Temperature of water bath (C) Pressure in lab (atm) Gas Constant 100.0 + 100.0 + 75.6 mL = 275.6 m L 145.81 g 149.25 g 3.44 g 84.1 C 0.914 atm 0.0821 (L'atm)/(mol*K) a. Calculate the mol of gas in the flask using the ideal gas law. 0.008596moles b. Calculate the molar mass of the unknown. 400 g/mol 3. If a student added more than 4 mL of volatile liquid, would it affect the laboratory today? How? What if less liquid was added?