Phosphorus    pentachloride    thermally    dissociates    according    to    reaction given    below. PCl5(g) ⇌ PCl3(g) + Cl2(g) a) What    is    the    equilibrium    expression,    in    term    of    mole    fractions,    for    this    reaction? b) What    is    the    mole    fraction, Xi ,    in terms    of    α,    for    each    species present?     Here,  α is    the     degree    of    dissociation    of    the    reaction. c) If     the    degree    of    dissociation is    0.920    at 600    K and    5.0 bar,    what    is     the    value    of     the     equilibrium    constant

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