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Question: According to (9.3), photosynthesis stores 460 kJ per mole C. Use  this to calculate how much energy is stored per year by the global  terrestrial net primary production. How much is this in Watts (J/s)?  Answer: 50 GtC/y -> 1.9 × 1021 J/y = 6.1 × 1013 W

Question: According to (9.3), photosynthesis stores 460 kJ per mole C. Use  this to calculate how much energy is stored per year by the global  terrestrial net primary production. How much is this in Watts (J/s)?  Answer: 50 GtC/y -> 1.9 × 1021 J/y = 6.1 × 1013 W

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Question: According to (9.3), photosynthesis stores 460 kJ per mole C. Use 
this to calculate how much energy is stored per year by the global 
terrestrial net primary production. How much is this in Watts (J/s)? 

Answer: 50 GtC/y -> 1.9 × 1021 J/y = 6.1 × 1013 W

The energy absorbed in the formation of biomass from solar radiation during photosynthesis equals that emitted as heat in combustion, since: photosynthesis AH + CO, + 2H,0 [CH,O] + O, + H,0 (9.3) combustion AH= 460 KJ per mole C = 4.8 eV per atom C = 16 MJ kg-' of dry carbohydrate material Here AH is the enthalpy change of the combustion process, equal to the energy absorbed from the photons of solar radiation in photosynthesis, less the energy of respiration during growth and losses during precursor reactions (see §9.4). AH may be considered as the heat of combustion; its exact value depends on whether or not water formed is liquid or vapor. Note that combustion requires temperatures of ~400°C, whereas respiration proceeds by catalytic enzyme reactions at -20°C. The uptake of CO, by a plant leaf is a function of many factors, especially tempera- ture, CO, concentration and the intensity and wavelength distributions of light.
Transcribed Image Text:The energy absorbed in the formation of biomass from solar radiation during photosynthesis equals that emitted as heat in combustion, since: photosynthesis AH + CO, + 2H,0 [CH,O] + O, + H,0 (9.3) combustion AH= 460 KJ per mole C = 4.8 eV per atom C = 16 MJ kg-' of dry carbohydrate material Here AH is the enthalpy change of the combustion process, equal to the energy absorbed from the photons of solar radiation in photosynthesis, less the energy of respiration during growth and losses during precursor reactions (see §9.4). AH may be considered as the heat of combustion; its exact value depends on whether or not water formed is liquid or vapor. Note that combustion requires temperatures of ~400°C, whereas respiration proceeds by catalytic enzyme reactions at -20°C. The uptake of CO, by a plant leaf is a function of many factors, especially tempera- ture, CO, concentration and the intensity and wavelength distributions of light.
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