Question

State the expression which attains a constant value in each of
the following equilibria.
(1) Urea(s) = Urea (solution)
() 02(8) O2 (aq)
(iii) Ice = H2O(1)​

Answer 1

Explanation:

CHEMISTRY

Consider the reaction,

N

2

(g)+3H

2

(g)⇌2NH

3

(g)

The equilibrium constant of the above reaction is K

P

. If pure ammonia is left to dissociate, the partial pressure of ammonia at equilibrium is given by:

(Assume that P

NH

3

<<P

total

at equilibrium)

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ANSWER

t=0

t=eq

2NH

3

P

1

P

NH

3

⇌

N

2

0

2

P

1

+

3H

2

0

2

3P

1

P=P

total

=

2

P

1

+

2

3P

1

=2P

1

∴P

1

=

2

P

k

eq

=

(P

NH

3

)

2

(P

N

2

)(P

H

2

)

⇒

k

p

1

=

(P

NH

3

)

2

(

2

P

1

)(

2

3P

1

)

3

∴

K

P

(P

NH

3

)

2

=

4

4

P

4

×3

3

∴P

NH

3

2

=K

p

4

4

P

4

×3

3

P

NH

3

=(K

p

4

4

P

4

3

3

)

2

1

=

16

(K

p

)

2

1

3

2

3

P

2