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 ...

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Author: Nivaldo Tro

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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 85E

Interpretation Introduction

To determine:

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

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Chapter 9, Problem 84E

Chapter 9, Problem 86E

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Pearson eText for Chemistry: structures and Properties -- Instant Access (Pearson+)

Ch. 9 - What is thermochemistry? Why is it important?Ch. 9 - What is energy? What is work? List some examples...Ch. 9 - Prob. 3E Ch. 9 - What is the law of conservation of energy? How...Ch. 9 - A friend claims to have constructed a machine that...Ch. 9 - What is a state function? List some examples of...Ch. 9 - What is internal energy? Is internal energy a...Ch. 9 - If energy flows out of a chemical system and into...Ch. 9 - If the internal energy of the products of a...Ch. 9 - What is heat? Explain the difference between heat...

Ch. 9 - How is the change in internal energy of a system...Ch. 9 - Explain how the sum of heat and work can be a...Ch. 9 - What is heat capacity? Explain the difference...Ch. 9 - Explain how the high specific heat capacity of...Ch. 9 - If two objects, A and B, of different temperature...Ch. 9 - What is pressure-volume work? How is it...Ch. 9 - What is calorimetry? Explain the difference...Ch. 9 - What is the change in enthalpy ( H) for a...Ch. 9 - Explain the difference between an exothermic and...Ch. 9 - From a molecular viewpoint where does the energy...Ch. 9 - From a molecular viewpoint, where does the energy...Ch. 9 - Is the change in enthalpy for a reaction an...Ch. 9 - Explain how the value of H for a reaction changes...Ch. 9 - What is Hess's law? Why is it useful?Ch. 9 - What is a standard state? 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