[bennyh]

Hi guys,
i'm not understand something simple in photosynthesis . according literature the process is endothermic with a huge amount of energy taken by surrounding ~2000Kj/mole.

1. i know that leaves doesn't freezing under those endothermic reaction and moreover they not getting cold but Photosynthesis  is endothermic reaction so why the temperature of leaves is not decreasing?

2. if natural Photosynthesis enthalpy is  around 2000kJ/mole  how much should be enthalpy of formation of artificial Photosynthesis ?

thanks for helpers

[Yggdrasil]

Most of the energy that fuels photosynthesis comes not from heat but from the absorption of solar energy by chlorophyll.

[bennyh]

Most of the energy that fuels photosynthesis comes not from heat but from the absorption of solar energy by chlorophyll.

so the term endothermic ( with +2,000 kj/mole) mean only UV absorption ?
non thermal heat is required? (if so the term is misleading)

[Borek]

non thermal heat is required? (if so the term is misleading)

No such thing as "non thermal heat" - if anything, you mean "non thermal energy".

In a way you are right, if treated literally, the term is misleading. But nobody treats it literally, it is always understood as "absorbing energy". The term was coined quite long ago and and retained its initial historical form.

[bennyh]

non thermal heat is required? (if so the term is misleading)

No such thing as "non thermal heat" - if anything, you mean "non thermal energy".

In a way you are right, if treated literally, the term is misleading. But nobody treats it literally, it is always understood as "absorbing energy". The term was coined quite long ago and and retained its initial historical form.

Thanks a lot

[Babcock_Hall]

The way in which the energy from photons is used to drive the synthesis of NADPH is something that you might want to look into.  The electrons from NADPH are indirectly supplied to carbon dioxide to bring it to the correct oxidation state, the oxidation state of carbohydrates.