What can be said about the sponatneity of the dimerization of sulfur in the gas

Question

What can be said about the sponatneity of the dimerization of sulfur in the gas phase?

2S(g) --> S2 (g)

delta H degree f KJ/mol S degree J/ (mol*K)

S(g) 277 238

S2(g) 129 80.

A. The formation of S2(g) (foward reaction) is spontaeous at all temperatures.

B. The formation of S(g) (reverse reaction) is spotaneous at all temperatures

C. The formation of S2(g) (foward reaction) is spontaeous at low temperatures and the formationof S(g) (reverse reaction) is spontaneous at high temperatures.

D. The formation of S(g) (reverse reaction) is spontaneous at low temperatures and thr formation of S2(g) (foward reaction) is spontaeous at high temperatures

Explanation / Answer

dhRXN = 129 - 277 = -148 kj/mol

DSrxn = 80 - 238 = -158 j/k.mol

as DHrxn , DSrxn is -ve .

C. The formation of S2(g) (foward reaction) is spontaeous at low temperatures and the formationof S(g) (reverse reaction) is spontaneous at high temperatures.

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