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Mass action rato or reaction quotient Q ...

Mass action rato or reaction quotient Q for a reaction can be calculate using the law of masss action
`A(g)+B(g) hArr C(g)+D(g)`
`Q=([C][D])/([A][B])`
The value of Q decides whether the reaction is at equilibrium or not.
At equilibrium, `Q=K`
For an equilibrium process, `Q ne K`
when `Q gt K`, reaction will favour backward direction and when `Q lt K`, it will favour direction.
Answer the following questions:
For the reaction:
`2A+B hArr 3C` at `298 K, K_(c)=40`
A `4L` vessel contains `2, 1,` and `4` mol of A, B and c, respectively. The reaction at the same temperature

A

Must proceed in forward direction

B

Must proceed in backward direction

C

Must be in equilibrium

D

Cannot be predicted

Text Solution

Verified by Experts

The correct Answer is:
A
`2A+B hArr 3C`
`[A]=("Mass")/("Volume")=2/4`
`[B]=1/4`
`[C]=4/4=1`
`:. Q=([C]^(3))/([A]^(2)[B])=((1)^(2))/((1/2)^(2)(1/4))=16`
Therefore `Q lt K_(c)` hence reaction will favour forward direction.
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Knowledge Check

  • Mass action ratio or reaction quotient Q for a reaction can be calculated using the law of mass actionl, A(g)+B(g)hArrC(g)+D(g) Q=([C][D])/([A][B]) The value of Q decides whether the reaction is at equilibrium or not. At equilibrium, Q=K For non-equilibrium process QneK When QgtK , reaction will be favoured in backward direction and when QltK , it will be favoured in forward direction. For the reaction : 2A+BhArr3C at 298 K, K_(c)=49 A 3 L vessel contains 2, 1 and 3 moles of A, B and C respectively. The reaction at the same temperature :

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  • Mass action rato or reaction quotient Q for a reaction can be calculate using the law of masss action A(g)+B(g) hArr C(g)+D(g) Q=([C][D])/([A][B]) The value of Q decides whether the reaction is at equilibrium or not. At equilibrium, Q=K For an equilibrium process, Q ne K when Q gt K , reaction will favour backward direction and when Q lt K , it will favour direction. Answer the following questions: In the reaction: NH_(4)Cl(g) hArr NH_(3)(g)+HCl(g) a graph is plotted to show that the variation or the rate of forward and backward reaction against time. Which of following is correct?

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