In a generic chemical reaction involving reactants A and B and products C and D, aA + bB cC + dD, the standard enthalpy AHxn of the reaction is given by AHxn = CAH; (C) + dAH; (D) —aAH; (A) – bAH; (B) Notice that the stoichiometric coefficients, a, b, c, d, are an important part of this equation. This formula is often generalized as follows, where the first sum on the right-hand side of the equation is a sum over the products and the second sum is over the reactants: AHrxn = Σproducts NAH; - reactants mAH where m and n represent the appropriate stoichiometric coefficients for each substance. Part A What is AHxn for the following chemical reaction? CS2(g) + 2H₂O(1)→CO2(g) + 2H₂S(g) You can use the following table of standard heats of formation (AH) to calculate the enthalpy of the given reaction. HA Element/Compound H(g) H₂(g) H₂O(1) CS₂ (g) Value C(g) C(s) Units Standard Heat of Formation (kJ/mol) ? 218 0 -285.8 116.7 71 0 Element/ Compound Express the standard enthalpy of reaction to three significant figures and include the appropriate units. ► View Available Hint(s) N(g) O₂(g) O(g) H₂S(g) CO₂(g) HNO3(aq) Standard Heat of Formation (kJ/mol) 473 0 249 -20.60kJ -393.5kJ -206.6
In a generic chemical reaction involving reactants A and B and products C and D, aA + bB cC + dD, the standard enthalpy AHxn of the reaction is given by AHxn = CAH; (C) + dAH; (D) —aAH; (A) – bAH; (B) Notice that the stoichiometric coefficients, a, b, c, d, are an important part of this equation. This formula is often generalized as follows, where the first sum on the right-hand side of the equation is a sum over the products and the second sum is over the reactants: AHrxn = Σproducts NAH; - reactants mAH where m and n represent the appropriate stoichiometric coefficients for each substance. Part A What is AHxn for the following chemical reaction? CS2(g) + 2H₂O(1)→CO2(g) + 2H₂S(g) You can use the following table of standard heats of formation (AH) to calculate the enthalpy of the given reaction. HA Element/Compound H(g) H₂(g) H₂O(1) CS₂ (g) Value C(g) C(s) Units Standard Heat of Formation (kJ/mol) ? 218 0 -285.8 116.7 71 0 Element/ Compound Express the standard enthalpy of reaction to three significant figures and include the appropriate units. ► View Available Hint(s) N(g) O₂(g) O(g) H₂S(g) CO₂(g) HNO3(aq) Standard Heat of Formation (kJ/mol) 473 0 249 -20.60kJ -393.5kJ -206.6
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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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
Transcribed Image Text:In a generic chemical reaction involving reactants and B and products C and D, aA + bB cC + dD, the standard enthalpy AHin of the reaction is given by
AHixn = CAH; (C) + dAH; (D) —aAH (A) – bAH (B)
Notice that the stoichiometric coefficients, a, b, c, d, are an important part of this equation. This formula is often generalized as follows, where the first sum on the
right-hand side of the equation is a sum over the products and the second sum is over the reactants:
where m and n represent the appropriate stoichiometric coefficients for each substance.
Part A
What is AHxn for the following chemical reaction?
CS2(g) + 2H₂O(1)→CO2(g) + 2H₂S(g)
You can use the following table of standard heats of formation (AH) to calculate the enthalpy of the given reaction.
■
μÅ
Value
AHrxn=products H - Σreactants mΔΗ
Element/ Compound
H(g)
H₂(g)
H₂O(1)
CS2 (g)
C(g)
C(s)
Units
?
Standard Heat of
Formation (kJ/mol)
Express the standard enthalpy of reaction to three significant figures and include the appropriate units.
► View Available Hint(s)
218
0
-285.8
116.7
71
0
Element/ Compound
N(g)
O₂(g)
O(g)
H₂S(g)
CO₂ (g)
HNO3(aq)
Standard Heat of
Formation (kJ/mol)
473
0
249
-20.60kJ
-393.5kJ
-206.6
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