The signs for Δ r S ° and Δ r H ° with respect to the reaction of sodium with water should be predicted without using calculations. Concept introduction: The standard entropy change for any reaction is the sum of standard molar entropies of products, subtracted from the sum of standard molar entropies of reactants. The standard molar entropies are multiplied by the stoichiometric coefficient which is as per the balanced equation. Δ r S ° = ∑ n S ° ( products ) − ∑ n S ° ( reactants ) The enthalpy change for any reaction can be expressed similarly, Δ r H ° = ∑ n H ° ( products ) − ∑ n H ° ( reactants ) The sign of Δ r H ° tells if the reaction is exothermic or endothermic.

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 47GQ
Interpretation Introduction

Interpretation:

The signs for ΔrS° and ΔrH° with respect to the reaction of sodium with water should be predicted without using calculations.

Concept introduction:

The standard entropy change for any reaction is the sum of standard molar entropies of products, subtracted from the sum of standard molar entropies of reactants. The standard molar entropies are multiplied by the stoichiometric coefficient which is as per the balanced equation.

ΔrS°=nS°(products)nS°(reactants)

The enthalpy change for any reaction can be expressed similarly,

ΔrH°=nH°(products)nH°(reactants)

The sign of ΔrH° tells if the reaction is exothermic or endothermic.

Expert Solution

Want to see the full answer?

Check out a sample textbook solution.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.