Answered: ) For the reaction above, what is the…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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The heat given off under standard state conditions when water is formed from its elements as both a liquid and a gas has been measured. The standard state of a liquid or solid substance is the pure substance at 1 bar. The standard state for gases is the ideal at 1bar and 25 C.

H2 (g) + 1/2 O2 (g) ---> H2O (l) ΔHr = -285.83 kJ/mol

H2 (g) + 1/2 O2 (g) ---> H2O (g). ΔHr = -241.82 kJ/mol

a) For the reaction above, what is the sinificance of the sign of ΔHr?

b) What would be the enthalpy change for the reverse of the first reaction?

c) Use these data and Hess' law to calculate ΔHr for the following reaction

H2O(l) ----> H2O (g)

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