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Politics : Politics of Energy -- Ignore unavailable to you. Want to Upgrade?

To: Eric who wrote (47247)

2/3/2014 5:20:41 AM

From: russet

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R2O

Read Replies (1) | Respond to of 86363

From your reference: percentage of hydrogen is a small component in weight terms. Carbon is ten to thirty times greater.

Now tell me in percentage terms what is the total heat of combustion of the various bonds types present in coal when oxidized completely? In other words, what does each type of bond contribute to the overall heat of combustion? Are the C-H bonds contributing much heat when oxidized, or is the majority coming from other covalent bond types?

If you fail in this, don't ever come back here to debate anything.

The classification of coal is generally based on the content of volatiles. However, the exact classification varies between countries. According to the German classification, coal is classified as follows: [12]

German ClassificationEnglish DesignationVolatiles %C Carbon %H Hydrogen %O Oxygen %S Sulfur %Heat content kJ/kg

Braunkohle	Lignite (brown coal)	45–65	60–75	6.0–5.8	34-17	0.5-3	<28,470
Flammkohle	Flame coal	40-45	75-82	6.0-5.8	>9.8	~1	<32,870
Gasflammkohle	Gas flame coal	35-40	82-85	5.8-5.6	9.8-7.3	~1	<33,910
Gaskohle	Gas coal	28-35	85-87.5	5.6-5.0	7.3-4.5	~1	<34,960
Fettkohle	Fat coal	19-28	87.5-89.5	5.0-4.5	4.5-3.2	~1	<35,380
Esskohle	Forge coal	14-19	89.5-90.5	4.5-4.0	3.2-2.8	~1	<35,380
Magerkohle	Nonbaking coal	10-14	90.5-91.5	4.0-3.75	2.8-3.5	~1	35,380
Anthrazit	Anthracite	7-12	>91.5	<3.75	<2.5	~1	<35,300
Percent by weight

The middle six grades in the table represent a progressive transition from the English-language sub-bituminous to bituminous coal, while the last class is an approximate equivalent to anthracite, but more inclusive (US anthracite has < 6% volatiles).