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
An isolated system is one in which

Mass crosses the boundary but not the energy
Mass does not cross boundaries of the system, though energy may do so
Both energy and mass cross the boundaries of the system
Neither mass nor energy crosses the boundaries of the system

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