Question

Physic chemistry

94. There are processes in which the ΔSuniv. is <0. Answer True or false and why?

Answer 1

∆Suniv < 0 it is practically Impossible because it signify the process is spontaneous in opposite direction.The universe tends toward disorder or randomness. delta S cannot be less than 0.

In any spontaneous process, the entropy of the universe (i.e., the system plus its surroundings) increases. More simply: The entropy of the universe is increasing. Note that the entropy of a system can decrease if that of the surroundings increases. ∆Suniv = ∆Ssys + ∆Ssurr Because ∆S = qrev / T and qrev > qirrev it follows that ∆S > qirrev / T Combining these two equations yields: ∆S ≥ q / T.