Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Acetic acid, CH3CO2H, can form a dimer, (CH3CO2H)2, in the gas phase.
2CH3CO2H(g)⟶ (CH3CO2H)2(g)
The dimer is held together by two hydrogen bonds with a total strength of 66.5 kJ per mole of
dimer and forming bonds is exothermic.
At 25 °C, the equilibrium constant for the dimerization is 1.3 × 103. What is ΔS° for the reaction
and what is the entropy if only half a mole of the dimer forms?
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