
(a)
Interpretation:
The value of enthalpy change
Concept introduction:
The change in the enthalpy of a reaction when the reactant is converted into product under standard conditions is called standard enthalpy of reaction.
The expression for standard enthalpy of reaction is,
Here,
(a)

Explanation of Solution
The value of
Given:
Refer to Appendix L for the values of standard enthalpy of formation.
The standard enthalpy of formation of
The standard enthalpy of formation of
The standard enthalpy of formation of
The standard enthalpy of formation of
The reaction involved in photosynthesis is,
The
Substitute the value of
The value of
(b)
Interpretation:
The enthalpy change involved in producing one molecule of glucose by the process of photosynthesis at
Concept introduction:
The relationship between the number of moles and the number of molecules is,
Also,
(b)

Explanation of Solution
The enthalpy change involved in producing one molecule of glucose by the process of photosynthesis at
Given:
The enthalpy change involved in the production of one mole of glucose by the process of photosynthesis at
Since
The enthalpy change involved in producing one molecule of glucose by the process of photosynthesis is
(c)
Interpretation:
The energy of a photon of light having a wavelength
Concept introduction:
The energy of one photon
Here,
Value of
(c)

Explanation of Solution
The energy of a photon of light having wavelength
Given:
The wavelength of light is
The speed of light is
Planks constant is
Substitute the values in equation (2).
The energy of a photon of light having wavelength
(d)
Interpretation:
The absorption of one photon at
Concept introduction: If the energy of one photon is greater than the energy required for the production of one mole of substance then single photon absorption is sufficient for the reaction to proceed else multiple photons must be absorbed.
(d)

Explanation of Solution
The energy of one photon calculated in part(c) is
Therefore multiple photons must be absorbed for the production of one molecule of glucose by photosynthesis reaction.
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Chapter 24 Solutions
Chemistry & Chemical Reactivity
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