A student mixes 37.0 mL of 3.00 M Pb(NO3)2(aq) with 20.0 mL of 0.00161 M Na2C2O4(aq). Calculate how many moles of PbC2O4(s) precipitate from the new solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °C?