When 20g of CaCO3 were put into 10 litre of flask and heated to 8000 C , 35% of CaCO3 remained unreacted at equlibrium. KP for decomposition of CaCO is :

  • Option 1)

    1.145 atm

  • Option 2)

    0.145 atm

  • Option 3)

    2.145 atm

  • Option 4)

    3.145 atm

 

Answers (1)
V Vakul

As learnt in

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

                     Ca CO_{3}(s)\ \ \ \rightleftharpoons\ \ \ Ca O(s) \ + \ \ \ CO_{2} (g)

At t=0                  0.2

At equilibrium     0.2*0.35                        0.2* 0.65             0.2* 0.65

K_{p} =p_{CO}_{2}

= \frac{nRT}{V} = \frac{0.2\times 0.65\times 0.0821\times 1073K}{10} atm

=1.145 \:\:atm

 

 


Option 1)

1.145 atm

This solution is correct

Option 2)

0.145 atm

This solution is incorrect

Option 3)

2.145 atm

This solution is incorrect

Option 4)

3.145 atm

This solution is incorrect

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