1.mnoprotic weak acid, HA , dissociates in water according to the reaction HA(aq)+H2O(l)H3O+(aq)+A(aq) The equilibrium concentrations of the reactants and products are [HA]=0.270 M , [H3O+]=4.00104 M , and [A]=4.00104 M . Calculate the a value for the acid HA

2.

for the reaction

2H2O(g) 2H2(g)+O2(g)2H2O(g) 2H2(g)+O2(g)

the equilibrium concentrations were found to be [H2O]=0.250 M[H2O]=0.250 M, [H2]=0.500 M[H2]=0.500 M, and [O2]=0.800 M[O2]=0.800 M. What is the equilibrium constant for this reaction?