Answered: * Enthalpy Constants Enthalpy H is a…

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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36 of 42
* Enthalpy
Constants Periodic Table
Enthalpy H is a measure of the energy content of a
system at constant pressure. Chemical reactions
involve changes in enthalpy, AH, which can be
measured and calculated:
ngs
Part A
AHan =Eproducts mAH;
Eresctants nAH
Determine the enthalpy for this reaction:
where the subscript "rxn" is for "enthalpy of reaction"
and "f" is for "enthalpy of formation" and m and n
represent the appropriate stoichiometric coefficients for
each substance.
Al(OH)3 (s) + 3HC1(g)→AIC13 (s) + 3H20(1)
Express your answer in kilojoules per mole to one decimal place.
> View Available Hint(s)
The following table lists some enthalpy of formation
values for selected substances
Substance
AH (kJ/mol)
HCl(g)
-92.0
kJ/mol
Al(OH)3 (s)
-1277.0
AH =
H20(1)
-285.8
AlCk (s)
-705.6
Submit
Previous Answers
H20(g)
-241.8
X Incorrect; Try Again; 26 attempts remaining
Part B
P Pearson
1 3.56
acer

Transcribed Image Text:dent. Elk Grove Unified- O My Profile- Zoom Results of the chec. My Citation list 9/2. Pearson Sign In O College Board - SAT.. >> halpy 36 of 42 Constants Periodic Table halpy H is a measure of the energy content of a tem at constant pressure. Chemical reactions olve changes in enthalpy, AH, which can be asured and calculated: Part B Hixu = Eproducts mAH" - bactauts Consider the reaction nere the subscript "rxn" is for "enthalpy of reaction" nd "f" is for "enthalpy of formation" and m and n present the appropriate stoichiometric coefficients for ach substance. 2A1(OH)3(s)→AL03(s) + 3H2O(1) with enthalpy of reaction AH = 21.0kJ/mol The following table lists some enthalpy of formation alues for selected substances. What is the enthalpy of formation of Al½O3(s)? AH (kJ/mol) Express your answer in kilojoules per mole to one decimal place. Substance HCl(g) -92.0 > View Available Hint(s) Al(OH)3 (s) -1277.0 H2O(1) -285.8 AICls (s) -705.6 kJ/mol AH = H2O(g) -241.8 Submit Previous Answers X Incorrect; Try Again; 26 attempts remaining P Pearson O i 3: acer

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