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Flue gas exiting the boiler are used to preheat the water fed to the boiler from a temperature of 28C to 90C assuming: A mean specific heat capacity...

Flue gas exiting the boiler are used to preheat the water fed to the boiler from a temperature of 28°C to 90°C assuming:

A mean specific heat capacity for water over this temperature range to be 4.2kJkg-1K-1

A mean molar heat capacity for the flue gases up to 300°C to be 31kJKmol-1K-1

10% of the heat required to heat the water is lost in the heat exchanger

All water entering is converted to steam

Frome earlier answers in this question I have steam raised = 42831.3kgh-1 and the flame temperature to be 2148°C

the question asks: Determine the final outlet temperature?

Could somebody give me the equation(s) I need to get this answer?

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