Homework Help is Here – Start Your Trial Now!
Science
Chemistry
Hess's Law 1. State the Hess's Law.

Hess's Law 1. State the Hess's Law.

Chemistry
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...
See similar textbooks
icon
Related questions
icon
Concept explainers
Question
Hess's Law 1. State the Hess's Law. 2. Calculate the enthalpy change for the reaction : CAH4 (9) + H2 (9) - C2H6 (g) Given the following data: C2H4 (9) + 3 O2 (9) - 2 CO2 (9) + 2 H20 (1) i) ii) 2 C2H6 (9) + 7 0z (9) - 4 CO2 (9) + 6 H20 (1) iii) 2 H2 (9) + O2 (g) - 2 H20 (U AH° = - 1410.9 kJ AH° = - 3119.4 k) AH° = - 571.6 kJ 3. Calculate the standard enthalpy change for the reaction, C2H2 (9) + 2 H2 (9) - C2H6 (9) Given that: i) 2 C2H2 (9) + 5 O2 (9) - 4 CO2 (9) + 2 H20 (1) ii) 2 C2H6 (9) + 7 02 (0) - 4 CO2 (9) + 6 H20 (U) ii) 2 H2 (9) + O2 (9) - 2 H20 (() AH° = - 2599 kJ AH° = - 3119 kJ AH° = - 572 kJ 4. The enthalpy of combustion of methane is -891 kJmoli. Calculate the enthalpy of formation of methane if the enthalpy of formation of carbon dioxide and water are - 394 kJmol and -286 kJmol respectively. Chemical equation for formation of methane: Cs) + 2H2(9) → CHa(9) Given: CHA(9) + 202(9) - 2H20U + CO2(9) Cs) + Ozco) → CO2(9) Hz(g) + V2 O2 - H20 AH = -891 kJmol! AH = -394 kJmol! AH = -286 kJmol! TUTORIAL 2 CHM271 PRINCIPLES OF PHYSICAL CHEMISTRY 5. Calculate the standard enthalpy of formation of liquid methanol, CH;OH(I), using the following information: C (graphite) + 2H2(g) + 1/2 O2(g) - CH;OH(I) Given: C (graphite) + O2 - CO:(9) H2(g) + 2 O2 → H20(1) CH:OH(I) + 3/2 O2(9) - CO2(9) + 2H20(1) AH° = -393.5 kJ/mol AH° = -285.8 kJ/mol AH° = -726.4 kJ/mol 6. Calculate AH for this reaction: CHa(g) + NH3(g) - HCN(g) + 3H2(g) Given: N2(g) + 3 H2(g) -2 NH3(g) C(s) + 2 Hz(g) – CHa(g) H2(g) + 2 C(s) + N2(9) - 2 HCN(g) AH = -91.8 kJ AH = -74.9 kJ AH = +270.3 kJ
Transcribed Image Text:Hess's Law 1. State the Hess's Law. 2. Calculate the enthalpy change for the reaction : CAH4 (9) + H2 (9) - C2H6 (g) Given the following data: C2H4 (9) + 3 O2 (9) - 2 CO2 (9) + 2 H20 (1) i) ii) 2 C2H6 (9) + 7 0z (9) - 4 CO2 (9) + 6 H20 (1) iii) 2 H2 (9) + O2 (g) - 2 H20 (U AH° = - 1410.9 kJ AH° = - 3119.4 k) AH° = - 571.6 kJ 3. Calculate the standard enthalpy change for the reaction, C2H2 (9) + 2 H2 (9) - C2H6 (9) Given that: i) 2 C2H2 (9) + 5 O2 (9) - 4 CO2 (9) + 2 H20 (1) ii) 2 C2H6 (9) + 7 02 (0) - 4 CO2 (9) + 6 H20 (U) ii) 2 H2 (9) + O2 (9) - 2 H20 (() AH° = - 2599 kJ AH° = - 3119 kJ AH° = - 572 kJ 4. The enthalpy of combustion of methane is -891 kJmoli. Calculate the enthalpy of formation of methane if the enthalpy of formation of carbon dioxide and water are - 394 kJmol and -286 kJmol respectively. Chemical equation for formation of methane: Cs) + 2H2(9) → CHa(9) Given: CHA(9) + 202(9) - 2H20U + CO2(9) Cs) + Ozco) → CO2(9) Hz(g) + V2 O2 - H20 AH = -891 kJmol! AH = -394 kJmol! AH = -286 kJmol! TUTORIAL 2 CHM271 PRINCIPLES OF PHYSICAL CHEMISTRY 5. Calculate the standard enthalpy of formation of liquid methanol, CH;OH(I), using the following information: C (graphite) + 2H2(g) + 1/2 O2(g) - CH;OH(I) Given: C (graphite) + O2 - CO:(9) H2(g) + 2 O2 → H20(1) CH:OH(I) + 3/2 O2(9) - CO2(9) + 2H20(1) AH° = -393.5 kJ/mol AH° = -285.8 kJ/mol AH° = -726.4 kJ/mol 6. Calculate AH for this reaction: CHa(g) + NH3(g) - HCN(g) + 3H2(g) Given: N2(g) + 3 H2(g) -2 NH3(g) C(s) + 2 Hz(g) – CHa(g) H2(g) + 2 C(s) + N2(9) - 2 HCN(g) AH = -91.8 kJ AH = -74.9 kJ AH = +270.3 kJ
Expert Solution
steps

Step by step

Solved in 2 steps with 2 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Thermochemistry
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
SEE MORE TEXTBOOKS