For each reaction, calculate ΔH°_rxn, ΔS°_rxn, and ΔG°_rxnat 25 °C and state whether or not the reaction is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 25 °C? a. N₂O₄(g) → 2 NO₂(g)

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Hi everyone so asset 25°C. What is the standard entropy change on the reaction? The standard entropy change of the reaction in the standard change. And Gibbs free energy of the reaction. And is the reaction spontaneous. And if not we'll change in the temperature. Make it spontaneous. And if so should it be increased or decreased? We call that delta G. Of the reaction equals delta H. Other reaction honest. T. Times delta? S. Other reaction. We need to first find delta? S. Other reaction. That? S the reaction is gonna be able to the sun times the number of moles times DELTA. S. M. Other products minuses. Some times the number of moles times delta S. M. Other reactant doctor S. M. PCL three liquid Equals 217.1. Those park mall arms, Calvin, delta S. M. Of PCL three gas Hugo Strange 11.8. Those per mole kelvin. Delta? S. Other reaction, It goes one more of PCL three gas Times 3. 11.8. Those promote kelvin minus one more A. P. C. L. Three. Like what House 217 one jewels promote thomas Calvin with dr s. Of the reaction. Is that 0.095 kill jobs per kelvin. Now I need to find delta H. Of the reaction. That's equal to the sun comes the number of moles delta H. F. Other products minus the song times. Number of moles times delta H. F. Other reactant. Your delta H. F. A. PCL three liquid 3 19. soldiers per mole in delta H. F. PCL three. Yes. Like a 287 hill does promote a dozen H. Of the reaction. Give us one more a PCL three gas. I want to make it 287. We'll just promote minus one more the PCL three liquid. That was Mega 319.7. Just come up the delta H. Of the reaction. 33 held roles Delta G. Other reaction equals -25 plus minus 25. That's 1 to 73. 0.095 hill jewels per kelvin delta G. Of the reaction. Give us 4.5. Hello jules. That's a G. Other reaction is positive, but this is non spontaneous about delta H. And delta S. Is positive. Let's go. It's going to be spontaneous only at high temperatures. Thanks for watching my video and I hope it was helpful.

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Key Concepts

Thermodynamic Functions (ΔH°, ΔS°, ΔG°)

Spontaneity of Reactions

Temperature's Effect on Spontaneity