CHEM 161 Exam 1 Group Review Problem A pycnometer is a small glass container that can be used to determine the densities of liquids very precisely. It is weighed empty and then weighed again when it's filled with a liquid of known density, usually water. The volume of the pycnometer can be obtained from these two measurements and then density can be calculated using relevant mass information. a) Find the density of benzene at 20C given the following data: Empty mass: =32.105g Filled with water at 20C=42.062g, Density =0.9982g/mL Filled with benzene at 20C=40.873g, Density = ? b) Find the density of zinc at 20C given the following data: Empty mass =36.2142g Filled with water at 20C=46.1894g A sample of dry zinc is added to the empty pycnometer at 20C=38.1055g Water is added to fill the pycnometer with the zinc sample at 20C=47.8161g Density of water at 20C=0.99823g/mL