Chapter 5.8, Problem 5.21YT

(a)

Interpretation Introduction

Interpretation:

Three factors that contribute for making coal a dirty fuel has to be listed out.

Concept Introduction:

A fuel is a substance which releases energy in the form of heat while undergoing combustion. Hydrocarbons which have high heats of combustion make it a best fuel.

The general equation for the complete combustion of a hydrocarbon is written below,

${\text{\_ C}}_{\text{x}}{\text{H}}_{\text{y}}\text{+}{\text{\_ O}}_{\text{2}}\to \text{\_}{\text{CO}}_{\text{2}}\text{+}\text{\_}{\text{H}}_{\text{2}}\text{O}$

Coal is a good fuel becouse it is completely made up of carbon atoms. It is a fossil fuel.

Coals can be classified and graded according to the carbon percent and the impurity percent such as sulfur.

Anthracite coal has high carbon content.

(b)

Interpretation Introduction

Interpretation:

In 2011, a newspaper columnist remarked that the idea of clean coal remain a distant dream. Check whether the dream of clean coal come any closer to being realized or not.

Concept Introduction:

Heat of combustion: It is also known as potential heat of fuel. Heat of combustion of carbon depends on its allotropic form.

A fuel is a substance which releases energy in the form of heat while undergoing combustion. Hydrocarbons which have high heats of combustion make it a best fuel.

Coal is a good fuel becouse it is completely made up of carbon atoms. It is a fossil fuel.

Coals can be classified and graded according to the carbon percent and the impurity percent such as sulfur.