The enthalpy of vaporization of CH3OH is 6.40 kJ/mol. What is the entropy changefor vaporization of 20.0 g CH3OH if the boiling point of it is 40.0 0C? (atomic weightin amu: C 12.00; H 1.00; O 16.00)OA. 5.0 /kO B.12.8 J/KOc. 20.5 J/K18.5 J/KOD.100 J/KOE. Determine standard free energy change for the solubility of Ag2SO4 in 0.10 M NaClsolution at 25 °C. (Ksp of Ag2SO4 = 4.20 x 10-11)254 J/molO A.O B.- 25.7 kJ/molC.25.7 kJ/mol- 58.4 kJ/mol59.2 kJ/molE.

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for vaporization of 20.0 g CH3OH if the boiling point of it is 40.0 °C? (atomic weight in amu: C 12.00; H 1.00; O 16.00) OA. 5.0 J/k OB. 12.8 J/K Oc 20.5 J/K

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Chapter10: Energy

Section10.4: Using Energy In The Real World

Problem 7RQ

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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

The enthalpy of vaporization of CH3OH is 6.40 kJ/mol. What is the entropy change
for vaporization of 20.0 g CH3OH if the boiling point of it is 40.0 0C? (atomic weight
in amu: C 12.00; H 1.00; O 16.00)
OA. 5.0 /k
O B.
12.8 J/K
Oc. 20.5 J/K
18.5 J/K
OD.
100 J/K
OE.

Determine standard free energy change for the solubility of Ag2SO4 in 0.10 M NaCl
solution at 25 °C. (Ksp of Ag2SO4 = 4.20 x 10-11)
254 J/mol
O A.
O B.
- 25.7 kJ/mol
C.
25.7 kJ/mol
- 58.4 kJ/mol
59.2 kJ/mol
E.

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