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Standard XII

Chemistry

Derivation of Kp and Kc

20 gm of Ca...

Question

20 gm of $C a C O_{3}$ is allowed to dissociate in a 5.6 liters container at $819^{0} C$ . If 50% of $C a C O_{3}$ is dissociated at equilibrium the $^{'} K_{p}^{'}$ value is:

5 a t m

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1.6 a t m

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4.8 a t m

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10 a t m

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Solution

The correct option is B $1.6 a t m$
No. of moles of $C a C O_{3} = \frac{20}{100} = 0.2$
$K_{p} = K_{n} {(\frac{R T}{V})}^{Δ n_{g}} = [C O_{2}] {(R T)}^{Δ n_{g}} = \frac{0.1}{5.6} (0.0821 \times 1092) = 1.6 a t m$
Only $C O_{2}$ moles will be consider as it is in gas form and it will exert pressure only.

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Similar questions

20 g m

C a C O_{3}

is allowed to dissociate in a

5.6

litres container at

819^{o} C

. If

50 %

C a C O_{3}

is dissociate at equilibrium. The

K_{p}

value is:

Q. What is minimum mass (in g) of

C a C O_{3} (s)

will be required to establish the equilibrium

C a C O_{3} (s) ⇌ C a O (s) + C O_{2} (g)

1000 K

in a

4 L

container previously containing

C O_{2}

0.82 a t m

. Equilibrium constant

K_{P}

for the dissociation reaction

1.64 a t m

Q. For the following reaction,

1 g

mole of

C a {C O}_{3}

is enclosed in

5 L

container.

C a {C O}_{3} (s) ⟶ C a O (s) + {C O}_{2} (g)

K_{p} = 1.16

1073 K

, then percentage dissociation of

C a {C O}_{3}

is:

Q. Equilibrium constant

K_{p}

for the reaction

C a C O_{3 (s)} ⇌ C a O_{(s)} + C O_{2 (g)}

8.21

atm at

727^{0}

C,
if

10

mole of

C a C O_{3 (s)}

is placed in a

10

L container, what is the weight (in gm) of CaO formed at equilibrium.

50 g C a C O_{3}

are heated to

1073 K

in a

5 L

vessel. What percentage of

C a C O_{3}

would decompose at equilibrium? The value of

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for the reaction.

C a C O_{3} (s) ⇌ C a O (s) + C O_{2} (g)

1.15 a t m

1073 K

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20 gm of CaCO3 is allowed to dissociate in a 5.6 liters container at 8190C. If 50% of CaCO3 is dissociated at equilibrium the ′K′p value is:

The correct option is B 1.6 atmNo. of moles of CaCO3=20100=0.2Kp=Kn(RTV)Δng=[CO2](RT)Δng=0.15.6(0.0821×1092)=1.6atmOnly CO2 moles will be consider as it is in gas form and it will exert pressure only.

20 gm of $C a C O_{3}$ is allowed to dissociate in a 5.6 liters container at $819^{0} C$ . If 50% of $C a C O_{3}$ is dissociated at equilibrium the $^{'} K_{p}^{'}$ value is: