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.

BuyFind

Chemistry & Chemical Reactivity

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

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)=ΔrHT

Here, 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

Interpretation:

The reaction MgO(s)+C(graphite)Mg(s)+CO(g) 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)=ΔrHT

Here, 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.

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