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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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hat is the enthalpy change for a process? Is enthalpy a state function? In what experimental apparatus are enthalpy changes measured?

Interpretation Introduction

Interpretation:

The meaning of the enthalpy change for a process and whether the enthalpy is a state function or not is to be stated. The experimental apparatus used for the measurement of enthalpy changes is to be stated.

Concept Introduction:

The change in Gibbs free energy, enthalpy and entropy is represented by ΔG°, ΔH° and ΔS° respectively. The relation of ΔG° with ΔH° and ΔS° is shown as,

ΔG°=ΔH°TΔS°

The change in Gibbs free energy describes the spontaneity of the reaction. The change in enthalpy describes the relative bond strength in the substance, whereas the change in entropy describes the randomness in the system.

Explanation

Enthalpy gives the information regarding changes in heat or energy during the formation of reactant into products. The chemical reaction in which energy is released during the formation of products is known as an exothermic reaction. The energy released during the reaction is denoted by negative value of ΔH°. The chemical reaction in which energy is absorbed during the formation of products is known as an endothermic reaction.

Therefore, the loss or gain of heat during the conversion of a reactant into product is known as enthalpy change for a process

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