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How much pounds of CO2 is emitted per million BTU (British thermal unit- common thermal unit) when coal is burnt?

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How much pounds of CO2 is emitted per million BTU (British thermal unit- common thermal unit) when coal is burnt?

(a) 139

(b) 117

(c) 157

(d) 205

This question was addressed to me during an interview.

I'm obligated to ask this question of Fuel Burning in section Steam Power Plant of Energy Engineering

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Right option is (d) 205

Easy explanation: 205 million BTU is the pounds of CO2 that is emitted when coal is burnt. The amount of CO2 produced when a fuel is burned is a function of carbon content of fuel. The heat content, or the amount of energy produced when a fuel is burned, is mainly determined by the carbon(C) and hydrogen (H) content of the fuel.

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