Engineering Thermodynamics
The mass of excess air supplied is equal to

(23/100) × Mass of excess carbon
(100/23) × Mass of excess carbon
(100/23) × Mass of excess oxygen
(23/100) × Mass of excess oxygen

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Engineering Thermodynamics
According to First law of thermodynamics,

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
Total internal energy of a system during a process remains constant

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