Question

2) Consider the reaction: I2 (s) + H2 (g) → 2 HI (g) a) Calculate the...

2) Consider the reaction: I2 (s) + H2 (g) → 2 HI (g)

a) Calculate the value of the equilibrium constant Kp.

b) Calculate ΔGrxn at PHI = 2.55 atm, PH2 = 0.221 atm. Consider excess I2(s)

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Answer #1

I2 (s) + H2 (g) → 2 HI (g)

ΔGo rxn = ΔGof products - ΔGoreactants

              = 2 x 1.7 - 0

              = 3.4 kJ/mol

ΔGo = - R T ln Kp

3.4 = - 8.314 x 10^-3 x 298 x ln Kp

Kp = 0.254

Q = P2HI / PH2 = (2.55)^2 / 0.221

   = 29.42

ΔGrxn = ΔGo rxn + R T ln Q

          = 3.4 + 8.314 x 10^-3 x 298 x ln 29.42

ΔGrxn = 11.8 kJ/mol

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