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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

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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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