In which of the following reactions, increase in the volume at constant temperature does not affect the number of moles at equilibrium ?

  • Option 1)

    2NH_{3}\rightarrow N_{2}+3H_{2}\; \; \;

  • Option 2)

    C_{(g)}+(1/2)O_{2(g)}\rightarrow CO_{(g)}\; \; \;

  • Option 3)

    H_{2(g)}+O_{2(g)}\rightarrow H_{2}O_{2(g)}\; \; \;

  • Option 4)

    none\; of \; these.

 

Answers (1)

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)

For those reactions, where \Delta n=0,   increase in volume at constant temperature does not affect the number of moles at equilibrium.

 

  For those reaction where \Delta n=0, increase in volume at constant temperature does not affect the number of moles at equilibrium 


Option 1)

2NH_{3}\rightarrow N_{2}+3H_{2}\; \; \;

This option is incorrect 

Option 2)

C_{(g)}+(1/2)O_{2(g)}\rightarrow CO_{(g)}\; \; \;

This option is incorrect 

Option 3)

H_{2(g)}+O_{2(g)}\rightarrow H_{2}O_{2(g)}\; \; \;

This option is incorrect 

Option 4)

none\; of \; these.

This option is correct 

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