Acompound is broken down by chemical means during(1) chromatography (2) distillation (3) electrolysis (4) filtration

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

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Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.