answer is A.. wtf does the 2.854 come from though!?!?!?!?!?!!!
GCHEM question
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2.85 is the concentation of PCl5 that remain once equilibrium is reached
14.250 moles PCl5 / 3.00 L = 4.75 M
4.75 * 60% = 2.85, (4.75-2.85) = 1.9 (PCl3 and PCl2, since 1:1 stoich)
Kc = 1.90^2 / 2.85
not sure why in the answer there is 4 sig figs....
