How Much CO2 Would Be Capture In One Year? - Numerade

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To balance the combustion reaction of C9H16, we need to find the correct coefficients for O2, CO2, and H2O. The balanced equation is: $$\text{C}_9\text{H}_{16} + \frac{25}{2}\text{O}_2 \rightarrow 9\text{CO}_2 + 8\text{H}_2\text{O}$$ Show more…

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Problem 1: (i) The amount of carbon stored in fossil fuels is 2 x 1015 kg of carbon. If ALL of this carbon were extracted and combusted, how much carbon dioxide would this produce in metric tons of CO2 and in gigatons (Gt) of carbon? Molecular weights: C is 12, molecular oxygen (O2) is 32, and carbon dioxide (CO2) is 44, in equal units. (ii) The mass of molecular oxygen (O2) in the atmosphere is 1.2 x 1018 kg. Would burning ALL fossil fuels in this century consume too much of the atmospheric oxygen? [1 sentence response]

Joseph D.

Global Carbon Dioxide Mass Balance. Recent estimates of carbon dioxide emission and removal rates to and from the atmosphere are summarized in the following table: Gigatonnes of Carbon Emitted/Removed (10' metric tonnes): 26, 6, -10, -0.7, -10, 440, -440, 0.3 Carbon Dioxide Sink/Source: - Emissions from fossil fuels - Changes in land use - Ocean uptake - Weathering - CO2 fertilization - CO2 release by microorganisms - CO2 removal by photosynthesis - Volcanoes (a) Does your equation describe a steady-state or unsteady-state process? Use this equation to calculate the rate of accumulation of CO2 (not carbon!) in kg/year. (b) If fossil fuel combustion were to increase by +12%, recalculate the rate of accumulation of CO2 in the atmosphere in kg/year. (c) Using the data from the diagram above, calculate the rate-of-change in CO2 concentration in units of ppm per year, and compare this number to the measured rate-of-change of ~2.1 ppm per year. Note: ppm is parts-per-million: i.e. a mole fraction: the moles of CO2 per million moles of atmospheric gases. For this calculation, assume only the first 10 km of atmosphere is well mixed and contains 1.5 * 10^20 moles of gas. (d) Identify at least two natural processes that might release more CO2 as atmospheric CO2 concentration increases.

Adi S.

(a) A methane burner can be represented by the following combustion equation: CH4 + 2O2 -> CO2 + 2H2O If one tonne of methane is burnt, how many tonnes of carbon dioxide is produced? (6 marks) (b) If insufficient oxygen is supplied to the methane burner and carbon monoxide is produced instead of carbon dioxide, derive the combustion equation: CH4 + O2 -> CO + 2H2O (3 marks) (c) The methane burner supplies a total annual household heat requirement of 1800 kWh per year. Calculate the required methane supply in kilograms, assuming that it is operating at 0.21 kg CO2 per kWh. (3 marks) (d) Briefly state five potential benefits of biofuels. (6 marks) (e) A gasifier has been designed to use 20 tonnes an hour of air-dried chopped wood, producing 40 tonnes an hour of fuel gas with an energy content of 5 GJ per tonne. The plant requires a constant input of 25 MW supplied by the output gas. If the energy content of air-dried wood is 11 GJ per tonne, what is the overall maximum conversion efficiency of the system? Why is the actual efficiency likely to be lower? (6 marks)

Sri K.

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