Ammonium hydrogen sulphide, NH 4 HS ( s ) , is an unstable compound which easily decompose to NH 3 ( g ) and H 2 S ( g ) . Suppose 1 mol of N H 4 H S ( s ) is introduced into an empty closed 2

Question

Ammonium hydrogen sulphide, NH 4 ​ HS ( s ) , is an unstable compound which easily decompose to NH 3 ​ ( g ) and H 2 ​ S ( g ) . Suppose 1 mol of N H 4 ​ H S ( s ) is introduced into an empty closed 25L container and allowed to reach equilibrium at 25°C. The following thermodynamic data at 27°C are given [Given: R = 8.3 J / m o l − K , e − 10 = 5 × 1 0 − 5 volume of N H 4 ​ H S ( s ) can be neglected] Which of the following is/are CORRECT?

TestHub · Accepted Answer

(A) NH 4 ​ HS ( s ) ⇌ NH 3 ​ ( g ) + H 2 ​ S ( g ) ​ Δ rxn ​ G 0 = Δ rxn ​ H 0 − T Δ rxn ​ S 0 = − RT ln K e q b ​ = ( 104.1 × 1000 ) − ( 300 × 264 ) = − RT ln K e q b ​ ln K e q b ​ = − RT 24900 ​ = − 10 ln ( 5 × 1 0 − 5 ) = − 10 K p ​ = 5 × 1 0 − 5 NH 4 ​ HS ( s ) P ⇌ ​ NH 3 ​ ( g ) + H 2 ​ S ( g ) P 2 = 5 × 1 0 − 5 P = 0.7 × 1 0 − 2 T o t a lp ress u re = 2 P = 1.4 × 1 0 − 2 ( B ) Δ H > 0 f or Δ G < 0 ⇒ Δ S m u s t b e ′ + ′ v e ​

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