Chapter 5, Problem 5.116AP

(a)

Interpretation Introduction

Interpretation: The substances that have standard enthalpy of formation value equal to zero are to be identified.

Concept introduction: The stable and pure forms of the substances have zero enthalpy of formation value at standard condition.

To determine: If $\text{Pb}$ has standard enthalpy of formation value equal to zero at $1000°\text{C}$.

(b)

Interpretation Introduction

To determine: If ${\text{C}}_{\text{3}}{\text{H}}_{\text{8}}\left(g\right)$ has standard enthalpy of formation value equal to zero at $25.0°\text{C}$ and $1\text{atm}$ pressure.

(c)

Interpretation Introduction

To determine: If solid glucose has standard enthalpy of formation value equal to zero at room temperature.

(d)

Interpretation Introduction

To determine: If nitrogen ${\text{N}}_{\text{2}}\left(g\right)$ has standard enthalpy of formation value equal to zero at $25.0°\text{C}$ and $1\text{atm}$ pressure.