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In which one of the following equilibria,

$K_{p}\neq K_{c}?$
Option 1)
$2C(s)+O_{2}(g)\rightleftharpoons 2CO(g)$

Option 2)
$2HI(g)\rightleftharpoons H_{2}(g)+I_{2}(g)$
Option 3)
$NO_{2}(g)+SO_{2}(g)\rightleftharpoons NO(g)+SO_{3}(g)$
Option 4)
$2NO(g)\rightleftharpoons N_{2}(g)+O_{2}(g)$

Answers (1)

best_answer

Equilibrium constant in gaseous system -

For equilibrium involving gases, it is usually more convenient to express the equilibrium constant in terms of partial pressure.

- wherein

The ideal gas equation is written as

$PV=nRT$

Relation between Kp and Kc -

$K_{p}=K_{c}(RT)^{\bigtriangleup n}$

while calculating the value of K_p , pressure should be expressed in bar.

$1\:bar=10^{5}pa$

- wherein

$\bigtriangleup n$ = (number of moles of gaseous products) - (number of moles gaseous reaction)

$K_{p}=K_{c}(RT)^{\Delta n}$ IF $\Delta n=0$ $K_{p}=K_{c}$

IF $\Delta n\neq 0$ $K_{p}\neq K_{c}$

$\Delta n=$ changes in the number of moles of gas

= (total moles of gas in product side) - (Total moles of g on reactant size, check again option )

$2C(s)+O_{2}(g)\rightleftharpoons 2(Olg))$

solid phase

$\Delta n=2-1=1\rightarrow K_{p}\neq K_{c}$

Option 1)
$2C(s)+O_{2}(g)\rightleftharpoons 2CO(g)$

Option 2)

$2HI(g)\rightleftharpoons H_{2}(g)+I_{2}(g)$

Option 3)

$NO_{2}(g)+SO_{2}(g)\rightleftharpoons NO(g)+SO_{3}(g)$

Option 4)

$2NO(g)\rightleftharpoons N_{2}(g)+O_{2}(g)$

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Aadil

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