Question

1.) Write the equilibrium onstant expression for the reaction below (Keq): CH4(g)+2H2S(g) <--> CS2(g)+4H2(g) A reation...

1.) Write the equilibrium onstant expression for the reaction below (Keq):

CH4(g)+2H2S(g) <--> CS2(g)+4H2(g)

A reation mixture initially contains 0.50M CH4 ad 0.75M H2S. If the equilibrium concenration of H2 is 0.44M, find the equilibrium constatn (Kc) for the reaction.

2.) Express the equilibrium constant for the following reaction.

P4(s)+5O2(g) <--> P4O10(s)

Homework Answers

Answer #1

1) consider the equation is

CH4 + 2H2S --> CS2 + 4H2

the equilibrium constant is given by

Keq = [CS2] [H2]^4 / [CH4] [H2S]^2

consider the reaction

CH4 + 2H2S --> CS2 + 4H2

using ICE table

[CH4]eq = 0.5 - x

[H2S]eq = 0.75 -2x

[CS2]eq = x

[H2]eq =4x

given

[H2]eq = 0.44

so

4x = 0.44

x = 0.11

so

[CH4]eq = 0.5 - 0.11 = 0.39

[H2S] = 0.75 - 0.22 = 0.53

[CS2] = x = 0.11

[H2] = 0.44

now

Keq = [CS2] [H2]^4 / [CH4] [H2S]^2

Keq = [ 0.11] [0.44]^4 / [ 0.39] [0.53]^2


Keq = 0.0376

so

the equilibrium constant value is 0.0376


2) consider the given reaction

P4 (s) + 502 (g) ---> P401O (s)

we know that

solids are not considered in equilibrium constant expression

so

for this reaction

Kc = 1 / [02]^5

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