Fuels and Combustion
The heat of combustion of a fuel

Is always positive
Can't be known without calculating it
Is equal to the heat of formation
Is always negative

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Fuels and Combustion
Cannel coal

Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named
All of these
Is non-coking
Has a high volatile matter content and burns with a luminous smoky flame

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