Chapter 6, Problem 6.14QP

(a)

Interpretation Introduction

Interpretation:

For the given reaction, the work done by the system on the surroundings, work done by the surroundings on the system and no work done has to be identified.

Concept introduction:

First law of thermodynamics:

The first law of thermodynamics states that energy can be either destroyed or created but instead it can be converted from one form to other.

The equation for the first law of thermodynamics can be given as,

$\text{ΔU=q+w}$

• If system gains heat, then $\text{q}$= positive.
• If work is done on the system, then $\text{w}$= positive.
• If system loses heat, then $\text{q}$= negative.
• If work is done by the system, then $\text{w}$= negative.

(b)

Interpretation Introduction

Interpretation:

For the given reaction, the work done by the system on the surroundings, work done by the surroundings on the system and no work done has to be identified.

Concept introduction:

First law of thermodynamics:

The first law of thermodynamics states that energy can be either destroyed or created but instead it can be converted from one form to other.

The equation for the first law of thermodynamics can be given as,

$\text{ΔU=q+w}$

• If system gains heat, then $\text{q}$= positive.
• If work is done on the system, then $\text{w}$= positive.
• If system loses heat, then $\text{q}$= negative.
• If work is done by the system, then $\text{w}$= negative.

(c)

Interpretation Introduction

Interpretation:

For the given reaction, the work done by the system on the surroundings, work done by the surroundings on the system and no work done has to be identified.

Concept introduction:

First law of thermodynamics:

The first law of thermodynamics states that energy can be either destroyed or created but instead it can be converted from one form to other.

The equation for the first law of thermodynamics can be given as,

$\text{ΔU=q+w}$

• If system gains heat, then $\text{q}$= positive.
• If work is done on the system, then $\text{w}$= positive.
• If system loses heat, then $\text{q}$= negative.
• If work is done by the system, then $\text{w}$= negative.

(d)

Interpretation Introduction

Interpretation:

For the given reaction, the work done by the system on the surroundings, work done by the surroundings on the system and no work done has to be identified.

Concept introduction:

First law of thermodynamics:

The first law of thermodynamics states that energy can be either destroyed or created but instead it can be converted from one form to other.

The equation for the first law of thermodynamics can be given as,

$\text{ΔU=q+w}$

• If system gains heat, then $\text{q}$= positive.
• If work is done on the system, then $\text{w}$= positive.
• If system loses heat, then $\text{q}$= negative.
• If work is done by the system, then $\text{w}$= negative.