Engineering Thermodynamics
The universal gas constant (or molar constant) of a gas is the product of

Molecular mass of the gas and the specific heat at constant pressure
Atomic mass of the gas and the gas constant
Molecular mass of the gas and the specific heat at constant volume
Molecular mass of the gas and the gas constant

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Engineering Thermodynamics
Carbonization of coal consists of

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

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