20. The following thermodynamic data at 25°C have been tabu- lated for the gas-phase reaction shown as follows (dotted l

[answerhappygod]

20 The Following Thermodynamic Data At 25 C Have Been Tabu Lated For The Gas Phase Reaction Shown As Follows Dotted L 1 (136.42 KiB) Viewed 25 times

20. The following thermodynamic data at 25°C have been tabu- lated for the gas-phase reaction shown as follows (dotted lines represent hydrogen bonds): ...H-O 2 H-C H-C H- C-H 0-H... O-H b- (kJ mol-') -362.63 (JK-moll) 251.0 HCOOH(3) (HCOOH)2(8) -785.34 347.7 a. Write the equation for the standard heat of formation at 25°C of HCOOH(g) (specify the pressure and phase for each component). b. Calculate A,Hº, A,Sº, and A,Gº for the gas-phase dimer- ization at 298 K. Is the formation of dimer from mono- mers spontaneous under these conditions? c. Calculate the enthalpy change per hydrogen bond formed in the gas phase. Why is not a similar calculation useful to estimate the entropy or free energy of hydrogen-bond formation?