The concept of standard enthalpy of formation and standard state for an element and compound has to be discussed. Concept introduction: Standard enthalpy of formation ( ΔΗ f 0 ): The standard enthalpy of formation is defined as the change in enthalpy when one mole of a substance in the standard state (1atm of pressure and 298.15 K) is formed from its pure elements under the same conditions. Standard state: Standard state precisely defined as reference state. It is a common reference point that can used to compare thermodynamic properties. Hess’s law: Hess's law states that the change of enthalpy in a chemical reaction (i.e. the heat of reaction at constant pressure) is independent of the pathway between the initial and final states. ΔH 0 = ∑ ΔH 0 f (product) − ∑ ΔH 0 f (reactant)

BuyFind

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
BuyFind

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

Solutions

Chapter 7, Problem 9RQ
Interpretation Introduction

Interpretation:

The concept of standard enthalpy of formation and standard state for an element and compound has to be discussed.

Concept introduction:

Standard enthalpy of formation (ΔΗf0): The standard enthalpy of formation is defined as the change in enthalpy when one mole of a substance in the standard state (1atm of pressure and 298.15 K) is formed from its pure elements under the same conditions.

Standard state: Standard state precisely defined as reference state. It is a common reference point that can used to compare thermodynamic properties.

Hess’s law:  Hess's law states that the change of enthalpy in a chemical reaction (i.e. the heat of reaction at constant pressure) is independent of the pathway between the initial and final states.

ΔH0=ΔH0f (product)ΔH0f (reactant)

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.