In an experiment similar to the one performed in Experiment #3 a student measures the mass of a clean, dry and empty 25 mL graduated cylinder and finds it to be 63.486 g. She adds exactly 20.0 mL of ethanol to the cylinder and measures the mass again; it is 79.308 g. The temperature in the lab that day is 20ºC.  What is the density of the ethanol at this temperature?  Show all work; give answer to the correct number of significant figures. 1. What is the mass of the ethanol? A. 63.486 B. 142.794 C. 15.814 2. What is the volume of the ethanol? A. 20mL B. 25mL C. 20.0 mL 3. What is the density of ethanol at this temperature? A. 2.892 B. 0.633g/mL C. 0.791g/mL D. 0.79g/mL 4. How many significant figures should be in the answer? A. 5 B. 3 C.2

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