Consider the reaction: PH3BCl3(s) ⇌ PH3(g) + BCl3(g), Kc = 1.87×10−3. An excess amount of PH3BCl3 is added to a 250 mL flask at 80 °C. The flask is sealed, and the system is allowed to reach equilibrium. How much reagent was consumed to reach equilibrium? (a) 7.14×10−5 g (b) 0.0432 g (c) 0.0108 g (d) 1.63 g

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