Calculate Δ S universe for following chemical reaction : C ( g r a p hi t e ) + 2 H 2 ( g ) → C H 4 ( g ) ; Δ f H ∘ = − 74.81 k J , at 298 K . The standard entropies of C (graphite), H 2 ( g

Question

Calculate Δ S universe ​ for following chemical reaction : C ( g r a p hi t e ) + 2 H 2 ​ ( g ) → C H 4 ​ ( g ) ; Δ f ​ H ∘ = − 74.81 k J , at 298 K . The standard entropies of C (graphite), H 2 ​ ( g ) and CH 4 ​ ( g ) are 5.740 , 130.684 and 186.264 J/K-mol, respectively.

TestHub · Accepted Answer

Δ S R ​ e a c t i o n = [ 186.264 ] − [ 5.740 + 2 × 130.684 )] or Δ S S ​ ys t e m = − 80.844 J / K ​ Δ S S ​ u rro u n d in g = + T Δ H ​ = 298 74.81 × 1 0 3 ​ = 251 J / K Δ S U ​ ni v erse = − 80.844 + 251 = 170.2 J / K ​

Chemistry - Thermodynamics - II Question with Solution | TestHub

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