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
Gases have

No value of specific heat
Two values of specific heat
Only one value of specific heat
Under some conditions one value and sometimes two values of specific heat

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Engineering Thermodynamics
Coke is produced

When coal is first dried and then crushed to a fine powder by pulverizing machine
By heating wood with a limited supply of air to a temperature not less than 280°C
From the finely ground coal by moulding under pressure with or without a binding material
When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel

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