A rigid 2.00 L vessel at 298 K initially contains NH3(g) at 1.20 atm. The gas is allowed to dissolve into 250 mL of 0.200 M HCl(aq) present in the same vessel until the total pressure falls to 0.30 atm. The only reaction that occurs is
NH3(g) + HCl(aq) → NH4Cl(aq)
Assuming the volume of the solution remains 250 mL, what is the concentration of NH4Cl in the final solution?
a) 0.245M
b) 0.098M
c) 0.200M
d) 0.196M