Hydrocyanic acid hydrolyzes in water according to the reaction:
HCN(aq) + 2 H2O → NH4CO2
The rate constant for this reaction is 2.3 x 10-3 M-1 days-1 at a given temperature. Suppose you started with 2 M of HCN(aq), what would be the molar concentration of HCN(aq) at 20 days?