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  • Please help! Change in volume of the system does not alter the number of moles in which of the following equilibria?

Change in volume of the system does not alter the number of moles in which of the following equilibria?

  • Option 1)

    N_{2(g)}+O_{2(g)}\rightleftharpoons 2NO_{(g)}\; \; \;

  • Option 2)

    PC1_{5(g)}\rightleftharpoons PC1_{3(g)}+C1_{2(g)}\; \; \;

  • Option 3)

    N_{2(g)}+3H_{2(g)}\rightleftharpoons 2NH_{3(g)}\; \; \;

  • Option 4)

    SO_{2}C1_{2(g)}\rightleftharpoons SO_{2(g)}+C1_{2(g)}

 

Answers (1)

best_answer

As we learnt in 

Relation between Kp and Kc -

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

while calculating the value of Kp , 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)

 

 If\Delta n=0 then there is no effect of change in volume an equilibrium 

For reaction 

N_{2} \: _{(g)}+O_{2_\:{(g)}}\rightleftharpoons 2NO _{(g)}\:,\Delta n is zero

In this reaction the ratio of number of moles of reactants to products is same i.e. 2 : 2, hence change in volume will not alter the number of moles.

 


Option 1)

N_{2(g)}+O_{2(g)}\rightleftharpoons 2NO_{(g)}\; \; \;

This option is correct 

Option 2)

PC1_{5(g)}\rightleftharpoons PC1_{3(g)}+C1_{2(g)}\; \; \;

This option is incorrect 

Option 3)

N_{2(g)}+3H_{2(g)}\rightleftharpoons 2NH_{3(g)}\; \; \;

This option is incorrect 

Option 4)

SO_{2}C1_{2(g)}\rightleftharpoons SO_{2(g)}+C1_{2(g)}

This option is incorrect 

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