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Explain degree of dissociation....

Explain degree of dissociation.

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The fraction of number of moles dissociated at equilibrium to the total number of moles present initially is called degree of dissociation (or) degree of ionisation, represented by `alpha`.
`thereforealpha=("Number of moles dissociated at equilibrium")/("Total number of moles originally present")`
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Knowledge Check

  • Phosphorus pentachloride dissociates as follows in a closed reaction vessel, PCl_5(g)iffPCl_3(g)+Cl_2(g) If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of Pcl_5 is x, the partial pressure of Pcl_3 will be

    A
    `(x(x+1))P`
    B
    `((2x)(x+1))P`
    C
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    D
    `(x(1-x))P`

  • Phosphorus pentachloride dissociates as follows in a closed vesselm PCl_(5)(g)hArr PCl_(3)(g)+Cl_(2)(g) . If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl_(5) is x, the partial pressure of PCl_(3) will be :

    A
    `((2x)/(1-x))P`
    B
    `((x)/(x-1))P`
    C
    `((x)/(1-x))P`
    D
    `((x)/(1+x))P`

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