Chapter 4, Problem 4.31P

Interpretation Introduction

(a)

Interpretation:

The origins of Higher heating value (HHV) and Lower Heating Value (LHV) should be explained.

Concept Introduction:

Heating value of a fuel is absolute value of the enthalpy of combustion of the fuel.

Interpretation Introduction

(b)

Interpretation:

The value of HHV and LHV of CH₄(Natural Gas) should be calculated.

Concept Introduction:

For a general reaction, the enthalpy of combustion can be calculated as follows:

  $\Delta H^O={\displaystyle \sum _i{v}_i}\Delta H_{f,i}{}^O=\Delta H^O{}_{products}-\Delta H^O{}_{reac\tan ts}$

Here, $\Delta H_{\text{reactant}}$ is change in enthalpy of reactant and $\Delta H_{\text{product}}$ is change in enthalpy of product.

Interpretation Introduction

(c)

Interpretation:

The value of HHV and LHV for C₁₀H₂₂(n-decane) should be calculated.

Concept Introduction:

For a general reaction, the enthalpy of combustion can be calculated as follows:

  $\Delta H^O={\displaystyle \sum _i{v}_i}\Delta H_{f,i}{}^O=\Delta H^O{}_{products}-\Delta H^O{}_{reac\tan ts}$

Here, $\Delta H_{\text{reactant}}$ is change in enthalpy of reactant and $\Delta H_{\text{product}}$ is change in enthalpy of product.