General Chemistry
General Chemistry
4th Edition
ISBN: 9781891389603
Author: Donald A. McQuarrie, Peter A. Rock, Ethan B. Gallogly
Publisher: University Science Books
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Chapter 19, Problem 19.74P

(a)

Interpretation Introduction

Interpretation:

The possibility of having an equilibrium reaction mixture for which PHI=PH2=PI2 at 553K has to be predicted.

  H2(g)+I2(g)2HI(g),KP=85at553K

(a)

Expert Solution
Check Mark

Explanation of Solution

The reaction is given below.

  H2(g)+I2(g)2HI(g)KP=[HI]2[H2][I2]=85at280C

If PHI=PH2=PI2 at 553K, the value of KP will be 1, but its value is 85at553K which is a constant.

Therefore, it is not possible to have an equilibrium reaction mixture for which PHI=PH2=PI2at553K.

(b)

Interpretation Introduction

Interpretation:

The composition of the equilibrium reaction mixture has to be calculated.

  H2(g)+I2(g)2HI(g),KP=85at553K

Concept Introduction:

Relationship between KPandKC:

  KP=KC(RT)Δνgas

Where, Δνgas is the difference between the stoichiometric coefficients of the products and reactants in gaseous phase.

(b)

Expert Solution
Check Mark

Explanation of Solution

The reaction is given below.

  H2(g)+I2(g)2HI(g)KP=[HI]2[H2][I2]=85at553K

The reverse of the above reaction is required.

  2HI(g)H2(g)+I2(g)K'P=[H2][I2][HI]2=1KP=185=0.012

The value of KC for the above reaction can be calculated as given below.

  Δνgas=22=0KP=KC(RT)ΔνgasKP=KC(RT)0KC=0.012

The initial concentration of HI(g) can be calculated as given below.

  [HI]=MolesVolume=5.0g127.911gmol12.00L=0.02M

A concentration table can be set up as given below.

  Concentration(M)2HI(g)H2(g)+I2(g)Initial0.0200Change2x+x+xEquilibrium0.022xxx

Substitute the equilibrium concentrations into the equilibrium – constant expression as shown below.

  Kc=[HI]2[H2][I2]=0.012(x)2(0.02x)2=0.0120.952x2+(9.6×104)x(4.8×106)=0x=0.0017

The composition of the equilibrium reaction mixture is given below.

  [HI]=0.022x=(0.02)(2×0.0017)=0.016M[H2]=x=1.7×103M[I2]=x=1.7×103M.

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Chapter 19 Solutions

General Chemistry

Ch. 19 - Prob. 19.11PCh. 19 - Prob. 19.12PCh. 19 - Prob. 19.13PCh. 19 - Prob. 19.14PCh. 19 - Prob. 19.15PCh. 19 - Prob. 19.16PCh. 19 - Prob. 19.17PCh. 19 - Prob. 19.18PCh. 19 - Prob. 19.19PCh. 19 - Prob. 19.20PCh. 19 - Prob. 19.21PCh. 19 - Prob. 19.22PCh. 19 - Prob. 19.23PCh. 19 - Prob. 19.24PCh. 19 - Prob. 19.25PCh. 19 - Prob. 19.27PCh. 19 - Prob. 19.28PCh. 19 - Prob. 19.29PCh. 19 - Prob. 19.30PCh. 19 - Prob. 19.31PCh. 19 - Prob. 19.32PCh. 19 - Prob. 19.33PCh. 19 - Prob. 19.34PCh. 19 - Prob. 19.35PCh. 19 - Prob. 19.36PCh. 19 - Prob. 19.37PCh. 19 - Prob. 19.38PCh. 19 - Prob. 19.39PCh. 19 - Prob. 19.40PCh. 19 - Prob. 19.43PCh. 19 - Prob. 19.44PCh. 19 - Prob. 19.45PCh. 19 - Prob. 19.46PCh. 19 - Prob. 19.47PCh. 19 - Prob. 19.48PCh. 19 - Prob. 19.49PCh. 19 - Prob. 19.50PCh. 19 - Prob. 19.51PCh. 19 - Prob. 19.52PCh. 19 - Prob. 19.53PCh. 19 - Prob. 19.54PCh. 19 - Prob. 19.55PCh. 19 - Prob. 19.56PCh. 19 - Prob. 19.57PCh. 19 - Prob. 19.58PCh. 19 - Prob. 19.59PCh. 19 - Prob. 19.60PCh. 19 - Prob. 19.61PCh. 19 - Prob. 19.62PCh. 19 - Prob. 19.63PCh. 19 - Prob. 19.64PCh. 19 - Prob. 19.65PCh. 19 - Prob. 19.66PCh. 19 - Prob. 19.67PCh. 19 - Prob. 19.68PCh. 19 - Prob. 19.69PCh. 19 - Prob. 19.70PCh. 19 - Prob. 19.71PCh. 19 - Prob. 19.72PCh. 19 - Prob. 19.73PCh. 19 - Prob. 19.74PCh. 19 - Prob. 19.75PCh. 19 - Prob. 19.76PCh. 19 - Prob. 19.77PCh. 19 - Prob. 19.78PCh. 19 - Prob. 19.79PCh. 19 - Prob. 19.80PCh. 19 - Prob. 19.81PCh. 19 - Prob. 19.82PCh. 19 - Prob. 19.83PCh. 19 - Prob. 19.84PCh. 19 - Prob. 19.86PCh. 19 - Prob. 19.91PCh. 19 - Prob. 19.92PCh. 19 - Prob. 19.93PCh. 19 - Prob. 19.94P
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