Engineering Thermodynamics
The specific heat at constant volume is

The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
The amount of heat required to raise the temperature of 1 kg of water through one degree
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
Any one of the above

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Engineering Thermodynamics
The mass of flue gas per kg of fuel is the ratio of the

Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
Mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel
Mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas

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