20. The following thermodynamic data at 25°C have been tabu- lated for the gas-p

Question

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): O...H-O 2 H-C C-H O-H HCOOH(g) (HCOOH)2(8) a. Write the equation for the standard heat of formation at (kJ mol 1) 362.63 785.34 (JK1 mol 1) 251.0 347.7 25°C of HCOOH(g) (specify the pressure and phase for each component) b. Calculate .Ho. AS®, and ,Go for the gas-phase dimer- ization at 298 K. Is the formation of dimer from mono- mers spontaneous under these conditions? 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? c.

Explanation / Answer

20. The following thermodynamic data at 25°C have been tabu- lated for the gas-p

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