# The reaction C 6 H 12 O 6 ( s ) + 6O 2 ( g ) → 6CO 2 ( g ) + 6H 2 O ( l ) should be classified based on reaction types discussed in Table 18.1 on the basis of given Δ S ∘ and Δ H ∘ values. Concept introduction: The universe consists of two parts, systems and surroundings. The entropy change for the universe is the sum of entropy change for the system and for surroundings. Δ S ∘ ( universe ) = Δ S ∘ ( system ) + Δ S ∘ ( surroundings ) The Δ S ∘ ( universe ) should be greater than zero for a spontaneous process. The Δ S ∘ ( system ) can be calculated by the following expression, Δ S ∘ ( system ) = Δ r S ° = ∑ n S ° ( products ) − ∑ n S ° ( reactants ) The Δ S ∘ ( surroundings ) can be calculated by the following expression, Δ S ∘ ( surroundings ) = − Δ r H ∘ T Here, Δ r H ∘ is the enthalpy change for the reaction. Thus, a reaction can be categorized as spontaneous or non-spontaneous on the basis of the Δ S ∘ and Δ H ∘ values.

### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter 18, Problem 14PS

(a)

Interpretation Introduction

## Interpretation:The reaction C6H12O6(s) + 6O2(g)→6CO2(g) + 6H2O(l) should be classified based on reaction types discussed in Table 18.1 on the basis of given ΔS∘ and ΔH∘ values.Concept introduction:The universe consists of two parts, systems and surroundings. The entropy change for the universe is the sum of entropy change for the system and for surroundings.ΔS∘(universe)= ΔS∘ (system)+ΔS∘ (surroundings)The ΔS∘(universe) should be greater than zero for a spontaneous process.The  ΔS∘ (system) can be calculated by the following expression,ΔS∘ (system)=ΔrS°=∑nS°(products)−∑nS°(reactants)The ΔS∘ (surroundings) can be calculated by the following expression,ΔS∘ (surroundings)=−ΔrH∘THere, ΔrH∘ is the enthalpy change for the reaction.Thus, a reaction can be categorized as spontaneous or non-spontaneous on the basis of the ΔS∘ and ΔH∘ values.

(b)

Interpretation Introduction

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