ASAP. Five stars + brainless. A procedure calls for 4 parts reagent A to 16 parts water. What is the dilution of reagent A in water?

a) 4/16
b) 1/5
c) 1/4
d) 4/12

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.