Given the thermodynamic information below for ethylene glycol (molar mass = 62.068 g/mol): Normal melting point: -12.9 °C Normal boiling point: 197.3 °C Enthalpy change of fusion: 9.9 kJ/mol Enthalpy change of vaporization: 65.6 kJ/mol Molar heat capacity for the liquid phase: 149.5 J/mol K Molar heat capacity for the gas phase: 78 J/mol.K Determine the minimum amount of heat needed to vaporize an 18.0-g sample of ethylene glycol initially at 25.0 °C. Consider that all processes occur at 1 atm. Select one: a. h 34.1 kJ 747k1

Given the thermodynamic information below for ethylene glycol (molar mass = 62.068 g/mol): Normal melting point: -12.9 °C Normal boiling point: 197.3 °C Enthalpy change of fusion: 9.9 kJ/mol Enthalpy change of vaporization: 65.6 kJ/mol Molar heat capacity for the liquid phase: 149.5 J/mol K Molar heat capacity for the gas phase: 78 J/mol.K Determine the minimum amount of heat needed to vaporize an 18.0-g sample of ethylene glycol initially at 25.0 °C. Consider that all processes occur at 1 atm. Select one: a. h 34.1 kJ 747k1

Chemistry

10th Edition

ISBN:9781305957404

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

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Consider the data in the table. Compound Melting point (°C) AHrus (kJ/mol) Boiling point (°C) AH,ap (kJ/mol) HF -83.11 4.577 19.54 25.18 HCI -114.3 1.991 -84.9 17.53 HBr -86.96 2.406 -67.0 19.27 HI -50.91 2.871 -35.38 21.16 Using the data in the table, calculate ASs and AS for HF. vap ASs = J/(K - mol) ASvap J/(K - mol) Determine the entropy change when 8.40 mol HF(s) melts at atmospheric pressure. AS = J/K