MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryThermodynamics and ThermochemistryGibb’s Energy and Spontaneity

For the gas phase reaction, PCl g PCl g Cl g Which of the following conditions are correct?

A.H
B.H✓ Correct
C.H
D.H
Explanation

g H U n RT  and  G H T S for a spontaneous process, must be negative. 5 3 2 PCl g PCl g Cl g In this reaction,  g n  = 2 – 1 = 1 Thus,  H  is positive, i.e., > 0 If is positive, then to maintain the value of  G negative,  S  should be positive, i.e.  S 0 ,

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