21) Phosphorus pentachloride decomposes according to the chemical equation. A 0.237 mol sample of PCl5(g) is...

21) Phosphorus pentachloride decomposes according to the chemical equation. A 0.237 mol sample of PCl5(g) is injected into an empty 3.70 L reaction vessel held at 250

Expert Solution

Concentration of PCl₅ intially = 0.237/3.7 = 0.064M

PCl₅ <------------------> PCl₃ + Cl₂

at initial 0.064 0 0

At equilibrium 0.064 - x x x

Kc = [PCl₃][Cl₂ ]/[PCl₅]

1.8 = x²/(0.064-x)

x² + 1.8x - 0.115 = 0

x = 0.05

At eqilibrium

[PCl₅] = 0.064 - x = 0.064 - 0.05

= 0.014M

[PCl₃] = [Cl₂] = x = 0.05M

queen_honey_blossom answered 4 months ago

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