If the value of the equilibrium constant for the reaction PCl3(g) + Cl2(g) ↔ PCl5(g) is 1.00 x 103, what is the value of

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If the value of the equilibrium constant for the reaction
PCl3(g) + Cl2(g) ↔PCl5(g)
is 1.00 x 103, what is the value of the equilibriumconstant for this reaction at the same temperature?
PCl5(g) ↔ PCl3(g) +Cl2(g)
Select one:
a.Cannot be determined without additional information.
b.-1.00 x 10-3
c.1.00 x 103
d.1 x 10-3
e.-1.00 x 103