Answered: H2(g) + I2(g) ⇄ 2 HI(g) Kp = 69 at…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter16: Spontaneity Of Reaction

Section: Chapter Questions

Problem 94QAP: Hf for iodine gas is 62.4 kJ/mol, and S° is 260.7 J/mol K. Calculate the equilibrium partial...

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H₂(g) + I₂(g) ⇄ 2 HI(g) K_p = 69 at 340 K

50.0 g of HI is injected into an evacuated 5.00-L rigid cylinder at 340 K. What is the total pressure inside the cylinder when the system comes to equilibrium?

Expert Solution

Step 1

The equilibrium reaction taking place is given as,

=> H₂ (g) + I₂ (g) ⇄ 2 HI (g) K_p = 69

Given : Mass of HI taken = 50.0 g

And volume of vessel = 5.00 L

Molar mass of HI = Atomic mass of H + atomic mass of I = 1 + 127 = 128 g/mol.

Since mass = moles X molar mass

=> 50.0 = Initial moles of HI X 128

=> Initial moles of HI = 0.390625 mol.

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