Question

2. (a) The chemical equation for growing phytoplankton with light energy from the sun (photosynthesis) is...

2. (a) The chemical equation for growing phytoplankton with light energy from the sun
(photosynthesis) is given below:
106 CO2 + 16 NO3- + H2PO4- + 122H2O + 17H+ -> C106H263O110N16P + 138 O2
carbon nitrate phosphate water protons phytoplankton oxygen
dioxide
How much nitrate (kg) is required to grow 1 kg of phytoplankton?
(b) Respiration is the opposite process to photosynthesis in which bacteria break down organic materials (e.g. phytoplankton) using oxygen to release energy:
C106H263O110N16P + 138 O2 -> 106 CO2 + 16 NO3- + H2PO4- + 122H2O + 17H+
(i) How much oxygen (kg) is required to completely degrade 1 kg of phytoplankton?
(ii) If there is a maximum concentration of 10 mg/L of oxygen (O2) in water, how many liters of water would be required to supply the amount of oxygen calculated in part (i)?

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