What is the equilibrium concentration of BCl3 if a solid sample of PH3BC13 is placed in a 0.250 L closed vessel at 80.0 °C and decomposes until equilibrium is reached? Assume that there is solid present at equilibrium. At 80.0 °C, Kc = 1.87 x 10-³ for the reaction: PH3BC13(s) ⇒ PH3(g) + BCl3(g) Provide your answer in M, without units, and use the correct number of significant figures.

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