Explanation Given: The reactions are: C 2 H 4 (g)+H 2 (g)→C 2 H 6 (g) CO(g)+ H 2 O(g)→H 2(g)+CO_ 2 (g) 3NO 2 (g)+ H 2 O(l)→2 HNO_3 (aq) + NO (g) Cr 2 O 3 (s) +3CO(g)→2 Cr(s)+ 3CO 2 (g) When one mole of compound is formed from its elements during this process the change in enthalpy is called as the change in enthalpy of formation and both its elements and compound are in their standard state. The Δ H F 0 of the elements in their standard state is 0. Formula used: Δ H r x n 0 =∑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 , C 2 H 4 0 = 52.4kJ/mol Δ H F , H 2 0 = 0 kJ/mol Δ H F , C 2 H 6 0 = -84.68 kJ/mo 2-Calculate the Δ H rxn 0 Δ H rxn 0 =(1×-84.68 kJ/mol)-(1×52.4 kJ/mol +1×0 kJ/mol) Δ H rxn 0 =-137.08kJ b)1-Look for the Δ H F 0 from the respective table. Δ H F , CO 0 = -110.5 kJ/mol Δ H F , H 2 O 0 =-241.8 kJ/mol Δ H F , H 2 0 = 0 kJ/mol Δ H F , C O 2 0 = -393.5 kJ/mol 2-Calculate the Δ H r x n 0 Δ H r x n 0 = 1 × 0 K J m o l + 1 × - 393 ...

Chemistry: Structure and Properties Custom Edition for Rutgers University General Chemistry

15th Edition

ISBN: 9781269935678

Author: Nivaldo J. Tro

Publisher: Pearson Education

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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 10, Problem 85E

Interpretation Introduction

To determine:

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

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Chapter 10, Problem 84E

Chapter 10, Problem 86E

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Chemistry: Structure and Properties Custom Edition for Rutgers University General Chemistry

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