Calculate the ph of a solution prepared by dissolving 0.750 mol of nh3 and 0.250 mol of nh cl 4 in water sufficient to yield 1.00 l of solution. the kb of ammonia is 1.77 × 10-4 .

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3