Explanation Given: The reactions are: 2H 2 S(g)+3O 2 (g)→2H 2 O(l)+2SO 2 (g) SO 2 (g)+½O 2 (g)→SO 3 (g) C(s)+ H 2 O(g)→CO(g)+ H 2(g) N 2 O 4 (g)+4H 2 (g)→N 2 (g)+4H 2 O(g) The Δ H r x n of a reaction is equal to the difference between the standard enthalpy of the products and the standard enthalpy of the reactants. The H F 0 of the elements in their standard state is 0. Formula used: Δ H r x n =∑n products Δ H products 0 -∑n reactants Δ H reactants 0 where, n products and n reactants are the stoichiometric coefficients of products and reactants respectively. Δ H products 0 and Δ H reactants 0 are the standard enthalpy of the products and reactants respectively. Calculation: a)1- Look for the Δ H F 0 from the respective table. Δ H F , H 2 S 0 = -20.15 kJ/mol Δ H F , O 2 0 = 0 kJ/mol Δ H F , H 2 O 0 = -285.830 kJ/mol Δ H F , S O 2 0 = -296.830 kJ/mol 2-Calculate the Δ H rxn 0 Δ H rxn 0 = 2 × - 285 . 83 K J m o l + 2 × - 296 . 83 K J m o l - 2 × - 20 . 15 K J m o l + 3 × 0 K J m o l Δ H rxn 0 =-1125.02 kJ b)1- Look for the Δ H F 0 from the respective table. Δ H F , S O 2 0 = -296.83 kJ/mol Δ H F , O 2 0 =0 kJ/mol Δ H F , S O 3 0 = -395.72 kJ/mol 2-Calculate the Δ H rxn 0 Δ H rxn 0 = 1 × - 395 ...

Chemistry: Structure and Properties (2nd Edition)

2nd Edition

ISBN: 9780134293936

Author: Nivaldo J. Tro

Publisher: PEARSON

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Definition Definition Number that is expressed before molecules, ions, and atoms such that it balances out the number of components present on either section of the equation in a chemical reaction. Stoichiometric coefficients can be a fraction or a whole number and are useful in determining the mole ratio among the reactants and products. In any equalized chemical equation, the number of components on either side of the equation will be the same.

Chapter 9, Problem 86E

Interpretation Introduction

To determine:

The Δ $H_{rxn}^{0}$ using the standard formation enthalpies.

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Chapter 9, Problem 85E

Chapter 9, Problem 87E

Chapter 9 Solutions

Chemistry: Structure and Properties (2nd Edition)

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