The table below lists measured densities for benzene at 5 °C
CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
The table below lists measured densities for benzene at 5 °C.
Phase
Density (g cm⁻³)
Solid
0.890
Liquid
0.878
The molar mass of benzene is 78.11 g mol⁻¹.
(a) Calculate the molar volume (in cm³ mol⁻¹) of solid benzene at 5 °C.
(b) Calculate the molar volume (in cm³ mol⁻¹) of liquid benzene at 5 °C.
(c) Based on your answers to parts (a) and (b), evaluate whether the experimental data are consistent with the general relationship between molar volumes of solids and liquids for molecular substances. Provide reasoning that connects particle packing to the values you obtained.
(d) Identify one experimental source of uncertainty that could produce the small difference between the two molar volumes and briefly describe its effect on the calculated values.