contestada

Which of these statements is true?
(a) All spontaneous reactions have a negative enthalpy change
(b) All spontaneous reactions have a positive entropy change
(c) All spontaneous reactions have a positive free-energy change
(d) All spontaneous reactions have a negative free-energy change
(e) All spontaneous reactions have a negative entropy change

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Answer:

(d) All spontaneous reactions have a negative free-energy change

Explanation:

All spontaneous reactions releases free energy which can be used later for the work to be done. A reaction with a negative value for ΔG releases free energy and is thus spontaneous