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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Identify trends in S° values:

  1. (a) For the halogens: F2(g), Cl2(g), Br2(), I2(s).
  2. (b) For the gaseous hydrocarbons: CH4, C2H6, C3H8.

(a)

Interpretation Introduction

Interpretation: The trends in So values for the given halogens should be identified.

Concept introduction:

The standard molar entropy is the entropy of a substance which gained by the conversion of 1 mol of substance from perfect crystal to standard conditions. It is represented by the symbol So. Its value is dependent on various parameters such as temperature, pressure, volume, physical state and molecular structure.

Explanation

Entropy increases in the order solid < liquid < gas.  In the gaseous state, the particles are more random. In solids, the particles have fixed positions and entropy is less. In liquids, there are constraints due to forces between the particles

(b)

Interpretation Introduction

Interpretation: The trends in So values for the given gaseous hydrocarbons should be identified.

Concept introduction: The standard molar entropy is the entropy of a substance which is gained by the conversion of 1 mol of substance from perfect crystal to standard conditions. It is represented by the symbol So. Its value is dependent on various parameters such as temperature, pressure, volume, physical state and molecular structure.

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