Question

Question 7 Not yet answered Marked out of 10.00 P Flag question Which of the following represents a spontaneous system? Select one or more: - A. AS sys=-39 J/K/mol, ASgurr --30 J/K/mol * B. AS sys=12 J/K/mol, AS surr=-19 J/K/mol • C. AS sys=-22.2 J/K/mol, AS surr=39.3 J/K/mol DAS 24 J/K/mol, AS - -32 J/K/mol

Answer 1

For a system to be spontaneous; dS(universe) > 0

dS(universe) = dS(sys) +dS(surr)

A)
dS(Universe) = [-39 + -30]j/k/mol = - 69 J/K/mol;; dS(universe) < 0 -hence it is non spontaneous

B)
dS(Universe) = [12 + -19]j/k/mol = - 5 J/K/mol;; dS(universe) < 0 -hence it is non spontaneous

C)
dS(Universe) = [-22.2 + 39.3]j/k/mol = +17.1 J/K/mol;; dS(universe) > 0 -hence it is spontaneous

D)
dS(Universe) = [24 + -32]j/k/mol = - 8 J/K/mol;; dS(universe) < 0 -hence it is non spontaneous

So answer is Option C
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