In an evacuated rigid vessel of volume V litre, one mole of solid NH 4 HS is taken and the vessel is heated to T K. The equilibrium total pressure of gases is found to be P atm. The percentage dissoci

Question

In an evacuated rigid vessel of volume V litre, one mole of solid NH 4 HS is taken and the vessel is heated to T K. The equilibrium total pressure of gases is found to be P atm. The percentage dissociation of the solid into NH 3 (g) and H 2 S(g) is

TestHub · Accepted Answer

NH 4 HS(s) ⇌ NH 3 (g) + H 2 S(g) If fraction α of 1 mol dissociates: NH 3 = α, H 2 S = α, total gas = 2α mol PV = 2α RT gives α = PV/(2RT) Percentage dissociation = 100α = 50PV/RT% This is option (c).

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