Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. Because this light generation is an ATP-requiring reaction, firefly luciferase can be used to test for the presence of ATP. In this way, luciferase can test for the presence of life. The coupled reactions are 1. luciferin + O2 ⇌ oxyluciferin + light 2. ATP ⇌ AMP + PPi ΔG∘=-45.28 kJ/mol If the overall ΔG∘ of the coupled reaction is -8.03 kJ/mol , what is the standard free energy of the first reaction at 27∘C?

Explanation:

ΔG° = - 8.03 kJ/mol & ΔG = -45.28 kJ/mol

Thus:

Overall ΔG = (- 8.03 + 45.28) kJ/mol

ΔG = 37.25 kJ/mol

ΔG = 37250 J/mol

Temperature = 27 °C

= (27 + 273)K

= 300 K

Therefore :

ΔG = -RTInK

In K =

In K =  

In K =

In K = 14. 93

    K =

    K =

the standard free energy of the first reaction at 27 °C =

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance