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Hi, I have some questions about the concepts of energy in chemistry. #1 A particular chemical reaction...

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Chemistry

Hi, I have some questions about the concepts of energy inchemistry.

#1 A particular chemical reaction has a negative deltaH and anegative deltaS. Which statement is correct?
The answer:
-The reaction becomes spontaneous as temperature decreases.
Can someone please explain to me how this is true?

#2 For the process O2(g)---> 2O(g), deltaH = +498kJ. What wouldbe predicted for the sign of deltaS(rxn) and the conditions underwhich this reaction would be spontaneous?
The answer:
deltaS(rxn)=positive & spontaneous at low temperaturesonly.
Can someone please elaborate on this?

#3 For which reaction, carried out at standard conditions, wouldboth the enthalpy and entropy changes drive the reaction in thesame direction?
Answer:
N2(g) + 2O2(g) ---> 2NO2(g) deltaH=+67.7
Why?

Answer & Explanation Solved by verified expert
4.0 Ratings (657 Votes)
All the three questions are related to the application of expression i Delta G Delta H T Delta S ii Making out the sign of Delta G note that a negative sign with Delta G represents spontaneous reaction 1 In this case a negative value of T due to decrease in temperature    See Answer
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