A reaction mixture containing N 2 at 0 . 50 atm , H 2 at 3 . 0 atm and NH 3 at 0 . 50 atm is heated to 450 ° C . In which direction the reaction N 2 g + 3 H 2 g ⇌ 2 NH 3 g will go if K p is 4 . 28 × 10 - 5 ?

The given equilibrium reaction is N 2 g + 3 H 2 g ⇌ 2 NH 3 g . K p = 4 . 28 × 10 - 5 . Given, p N 2 = 0 . 50 atm , p H 2 = 3 . 0 atm and p NH 3 = 0 . 50 atm . The reaction quotient, Q = p NH 3 2 p N 2 × p H 2 3 = 0 . 50 2 0 . 50 × 3 2 = 0 . 055 . Since, Q > > K p , the reaction will proceed towards the direction of the reactants (reverse reaction).

The equilibrium constant for the reaction CH 3 COOH + C 2 H 5 OH ⇌ CH 3 COOC 2 H 5 + H 2 O is 4 . 0 at 25 ° C . Calculate the weight of ethyl acetate that will be obtained when 120 g of acetic acid are reacted with 92 g of alcohol.

The given equilibrium reaction is CH 3 COOH + C 2 H 5 OH ⇌ CH 3 COOC 2 H 5 + H 2 O . Given K p = 4 . 0 at 25 ° C . Initial number of moles of CH 3 COOH = 120 60 = 2 , C 2 H 5 OH = 92 46 = 2 . If x moles of the reactants undergo dissociation, at equilibrium, the concentrations of the reactants and the products are given below: CH 3 COOH = 2 - x V mol L - 1 , C 2 H 5 OH = 2 - x V mol L - 1 and CH 3 COOC 2 H 5 = H 2 O = x V mol L - 1 . Therefore, the equilibrium constant, K c = CH 3 COOC 2 H 5 × H 2 O CH 3 COOH × C 2 H 5 OH = x V × x V 2 - x V 2 = 4 , Hence, x = 1 . 33 mol . Therefore, CH 3 COOC 2 H 5 = x v = 1 . 33 mol L - 1 . Thus, the mass of ethyl acetate = 1 . 33 × 88 = 117 . 04 g .

HARD

11th CBSE

IMPORTANT

Earn 100

Calculate the degree of dissociation of $HI$ at $450 ° C$ if the equilibrium constant for the dissociation reaction is $0.263$ .

Important Questions on Equilibrium in Physical and Chemical Processes

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 8 - Equilibrium in Physical and Chemical Processes>PROBLEMS FOR PRACTICE>Q 8

One mole of pure ammonia was injected into a one litre flask at a certain temperature. The equilibrium mixture was then analysed and found to contain

0.30

mole of

H_{2}

. Calculate the concentration of

N_{2}

at equilibrium.

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 8 - Equilibrium in Physical and Chemical Processes>PROBLEMS FOR PRACTICE>Q 8

One mole of pure ammonia was injected into a one litre flask at a certain temperature. The equilibrium mixture was then analysed and found to contain

0.30

mole of

H_{2}

. Calculate the concentration of

{NH}_{3}

at equilibrium.

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 8 - Equilibrium in Physical and Chemical Processes>PROBLEMS FOR PRACTICE>Q 9

How much ${PCl}_{5}$ must be added to a one litre vessel kept at $250 ° C$ in order to obtain $0.1$ mole of ${Cl}_{2}$ gas? The equilibrium constant for the dissociation of ${PCl}_{5}$ at $250$ is $0.0414$ .

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 8 - Equilibrium in Physical and Chemical Processes>PROBLEMS FOR PRACTICE>Q 10

In an experiment,

2

moles of

HI

are taken into an evacuated

10.0

litre container at

720 K

. The equilibrium constant equals to

0.0156

for the gaseous reaction,

2 HI (g) ⇌ H_{2 (} g) + I_{2} (g)

. Calculate the amounts of

HI (g)

H_{2} (g)

I_{2} (g)

at equilibrium.

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 8 - Equilibrium in Physical and Chemical Processes>PROBLEMS FOR PRACTICE>Q 11

When

{PCl}_{5}

is heated in a closed vessel at

575 K

, the total pressure at equilibrium is found to be

1 atm

and partial pressure of

{Cl}_{2}

is found to the

0.324

atm. Calculate the equilibrium constant (

K_{p}

) for the decomposition reaction.

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 8 - Equilibrium in Physical and Chemical Processes>PROBLEMS FOR PRACTICE>Q 12

In the dissociation of

HI

20 % HI

is dissociated at equilibrium at a certain temperature. Calculate

K_{p}

for the reaction,

HI (g) ⇌ \frac{1}{2} H_{2} (g) + \frac{1}{2} I_{2} (g)

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 8 - Equilibrium in Physical and Chemical Processes>PROBLEMS FOR PRACTICE>Q 13

A reaction mixture containing

N_{2}

0.50 atm

H_{2}

3.0 atm

and

{NH}_{3}

0.50 atm

is heated to

450^{°} C

. In which direction the reaction

N_{2} (g) + 3 H_{2} (g) \overset{}{⇌} 2 {NH}_{3} (g)

will go if

K_{p}

4.28 \times 10^{- 5}

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 8 - Equilibrium in Physical and Chemical Processes>PROBLEMS FOR PRACTICE>Q 14

The equilibrium constant for the reaction

{CH}_{3} COOH + C_{2} H_{5} OH \overset{}{⇌} {CH}_{3} {COOC}_{2} H_{5} + H_{2} O

4.0

25^{°} C

. Calculate the weight of ethyl acetate that will be obtained when

120 g

of acetic acid are reacted with

92 g

of alcohol.

Calculate the degree of dissociation of HI at 450 °C if the equilibrium constant for the dissociation reaction is 0.263.

Important Questions on Equilibrium in Physical and Chemical Processes

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Calculate the degree of dissociation of $HI$ at $450 ° C$ if the equilibrium constant for the dissociation reaction is $0.263$ .