Carbon disulfide (CS2) is a toxic, highly flammable substance. The following thermodynamic data are available for CS2(l) and CS2(g) at 298 K:

(a) Draw the Lewis structure of the molecule. What do you predict for the bond order C-S of the bonds?
(b) Use the VSEPR method to predict the structure of the CS2 molecule.
(c) Liquid CS2 burns in O2 with a blue flame, forming CO2(g) and SO2(g). Write a balanced equation for this reaction.
(d) Using the data in the preceding table and in Appendix C, calculate ΔH° and ΔG° for the reaction in part (c). Is the reaction exothermic? Is it spontaneous at 298 K?
(e) Use the data in the table to calculate ΔS° at 298 K for the vaporization of CS2(l). Is the sign of ΔS° as you would expect for a vaporization?
(f) Using data in the table and your answer to part (e), estimate the boiling point of CS2(l). Do you predict that the substance will be a liquid or a gas at 298 K and 1 atm?

Transcribed Image Text:

AHf (kJ/mo AG (kJ/mol) CS2( 89.7 C$2g) 117.4 65.3 67.2