Achemist has one solution that is 80% acid and another solution that is 30% acid. how much of the second (30%) solution is needed to make a 400 l solution that is 62% acid?

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.