Engineering Thermodynamics
The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)

Q1 - 2 = dU + W1 - 2
Q1 - 2 = dU/W1 - 2
Q1 - 2 = dU - W1 - 2
Q1 - 2 = dU × W1 - 2

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Engineering Thermodynamics
Carbonization of coal consists of

Heating the wood with a limited supply of air to temperature not less than 280°C
Drying and crushing the coal to a fine powder
Moulding the finely ground coal under pressure with or without a binding material
None of these

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