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At $250^oC$, phosphorus pentachloride is dissociated:
$PCl_5(g)$ 
$PCl_3(g)$ $+$ $Cl_2(g)$
The equilibrium constant about the final molarities (molarities when equilibrium is established) is defined as :
.......... · >.......... | ||
| $K_c$ | = | ______________ |
.......... |
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