If you dissolved 0.15 moles fumaric acid into water, adjusted to pH 7.00 and brought the final mix to 1.0 liter total volume, what are the equilibrium values of [fumaric acid], [fumarate-1], and [fumarate-2] in the solution? (pK1 = 3.03, pK2 = 4.44)

Create a system of equations to solve for the unknown values.