Explanation A reaction that absorbs energy is called endothermic reaction. The value of energy in this type of reaction is positive. A reaction that releases energy is called exothermic reaction. The value of energy in this type of reaction is negative. The acid dissociation reaction of HF is, 1 HF ( g ) + H 2 O → F − ( g ) + H 3 O + ( g ) Formula used: The formula to calculate enthalpy is, Δ H rxn = ( ∑ ( Bond enthalpies of bond broken ) − ∑ ( Bond of enthalpies of bond formed ) ) ........ (1) Calculation: For the acid dissociation reaction of HF , the enthalpy is calculated by the formula, Δ H rxn = ∑ { H − F + 2 ( H − O ) } − ∑ { 3 ( H − O ) } Substitute the values of bond enthalpies of H − F and H − O in the equation (1), (refer to the table number 8

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Chapter 16, Problem 123IE

Interpretation Introduction

To determine: The enthalpies of the given gas-phase reactions.

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Chapter 16, Problem 122IE

Chapter 16, Problem 124IE

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Chapter 16 Solutions

MAST F/ CHEM: THE CENTRAL SCI CODE ALON

Ch. 16.2 - Practice Exercise 1 Consider the following...Ch. 16.2 - Prob. 16.1.2PE Ch. 16.2 - Prob. 16.2.1PE Ch. 16.2 - Practice Exercise 2 When lithium oxide (Li2O) is...Ch. 16.2 - Based on information in Figure 16.4, place the...Ch. 16.2 - Practice Exercise 2 For each reaction, use Figure...Ch. 16.3 - Practice Exercise 1 In a certain acidic solution...Ch. 16.3 - Practice Exercise 2 Indicate whether solutions...Ch. 16.3 - Prob. 16.5.1PE Ch. 16.3 - Prob. 16.5.2PE

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