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A student dissolves 0.90 moles of substance A and 2.00 moles of B in pure water and dilutes this solution to a volume of 1.00 L. The reaction A + 2B ⇌ C + 3D occurs. The student finds that the equilibrium concentration of C is 0.20 M. (a) Find the equilibrium concentrations of D, A and B. (b) Find the equilibrium constant for the reaction.