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At $250^oC$, phosphorus pentachloride is dissociated:
$PCl_5(g)$ 
$PCl_3(g)$ $+$ $Cl_2(g)$
$PCl_5(g)$ was heated at $250^oC$ until its concentration didn't change any more.
The equilibrium molarities were:
$[PCl_5]$ $=$ $0.015\frac{mol}{L}$
$[PCl_3]$ $=$ $0.025\frac{mol}{L}$
$[Cl_2]$ $=$ $0.025\frac{mol}{L}$
Then the equilibrium constant has the value:
.......... . >.......... | ||||
| $K_c$ | = | ______________ | = | .......... |
........ |
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