Engineering Thermodynamics
Mond gas is obtained by

Passing steam over incandescent coke
Carbonisation of bituminous coal
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing air and a large amount of steam over waste coal at about 650°C

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Engineering Thermodynamics
According to First law of thermodynamics,

Total internal energy of a system during a process remains constant
Work-done by a system is equal to the heat transferred by the system
Internal energy, enthalpy and entropy during a process remain constant
Total energy of a system remains constant

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