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S and H2O Reaction

S and H2O Reaction

S and H2O Reaction

(OP)
Will Steam (H2O) and sulfur react to produce H2S and Oxygen?  Anybody have a chart showing the reaction chemistry at different temperatures?

RE: S and H2O Reaction

No.  Consider the Gibbs free energy at 25oC of the reaction  
  H2O(g) + S(s) = H2S(g) + 1/2 O2(g)

  ΔGRxn, 298 K = -33.4 - (-228.6) kJ/mole
                    = +195.2 kJ/mole

But, you can burn H2S(g) with O2 to form SO2 + H2O  which forms sulfurous acid H2SO3 which can be oxidized to sulfuric acid, H2SO4.

RE: S and H2O Reaction

(OP)
Thanks for the response.  I think part of my confusion is coming from the use of an equilbrium code that shows H2S and O2 as equilbrium products at 300 K.  When I did a hand calc, like you showed, I get your answer.  Now I'm perplexed why I'm getting O2 and H2S as products (from this spreadsheet code)

RE: S and H2O Reaction

25362,
Thanks for the link. But, sulfate forms, not O2.

In the Frasch process, steam is pumped into underground deposits in order to extract liquid elemental sulfur.

H2S hardly reacts with hot water under usual conditions:
H2S in hot water even with chlorination system
thread164-165833

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