the table shows data from an experiment involving three different species of phy

Question

the table shows data from an experiment involving three different species of phytoplankton. The objective was to determine the rate at which the concentration of dissolved oxygen changed in sealed chambers containing one species of phytoplankton in 1 litre of sea water at 18 °C.  

Species of                      Conditions          Rate of change in

phytoplankton                                        oxygen concentration

                                                              /mol O2 h1

Amphidinium carterae          light                 26.2

                                           dark               7.50

Biddulphia aurita                  light                40.3

                                           dark               5.10

Chaetoceros didymum           light                26.1

                                            dark               6.30



The number of moles of oxygen produced/consumed in the experiment

described in Table 1 can be related to the amount of energy stored or released

by the phytoplankton. If you assume that one mole of oxygen is equivalent to

500 kJ (3 sig figs) of energy, convert the values in Table 1 into units of

energy stored/released per hour, and display your answer as a new table

The first one has been done for you



Species of

phytoplankton         Rate of change in oxygen            Energy/ kJ h1
and conditions
                                concentration/mol O2h1

Amphidinium

carterae

        light                       26.2                                  0.0131

        dark                      7.50                             0.00375



I cant for the live of me see how they got Energy/ kJ h, from the information given can someone please show me

Explanation / Answer

Energy stored and released in KJ per hour is calculated from the rate of change in oxygen concentration.

Convert the um into mol and multiply with the energy released from the one mole of oxygen molecule.

one mole of oxygen is equivalent = 500 kJ of energy

phytoplankton Rate of change in oxygen Energy/ kJ h1
and conditions
   concentration/mol O2h1

Amphidinium

carterae                     

Light                                    26.2                            = 26.2 x 500 kJ x 10^-6 = 0.0131 kJ / h

Dark                                      -7.50                          = -7.50 x 500 kJ x 10^-6 = -0.00375 kJ / h

Biddulphia aurita

light                                      40.3                          = 40.3 x 500 kJ x 10^-6 = 0.0201 kJ / h

Dark                           5.10                       = -5.10 x 500 kJ x 10^-6 = - 0.0025 kJ /h

Chaetoceros didymum

light                              26.1                       = 26.1 x 500 kJ x 10^-6 = 0.0130 kJ /h

dark                             6.30                        = -6.30 x 500 kJ x 10^-6 = -0.00315 kJ/ h

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